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Why Tehran Is Running Out of Water

Why Tehran Is Running Out of Water

This story originally appeared on Bulletin of the Atomic Scientists and is part of the Climate Desk collaboration.

During the summer of 2025, Iran experienced an exceptional heat wave, with daytime temperatures across several regions, including Tehran, approaching 50 degrees Celsius (122 degrees Fahrenheit) and forcing the temporary closure of public offices and banks. During this period, major reservoirs supplying the Tehran region reached record-low levels, and water supply systems came under acute strain. By early November, the reservoir behind Amir Kabir Dam, a main source of drinking water for Tehran, had dropped to about 8 percent of its capacity. The present crisis reflects not only this summer’s extreme heat but also several consecutive years of reduced precipitation and ongoing drought conditions across Iran. As a result, the capital of Iran is now facing a potential “Day Zero” when taps could run dry.

The drought quickly disrupted Tehran’s urban systems. With dry soils and high evaporation, rivers and wetlands shrank. Falling reservoir levels led to disruptions in hydropower generation, and water shortages prompted strict saving measures across parts of the capital. Amid these escalating pressures, officials warned that the capital city may even have to be evacuated if water supplies fail to recover. In November, President Masoud Pezeshkian said the capital would have to be moved. These cascading impacts exposed how vulnerable Tehran’s infrastructure, economy, and communities have become under compounding heat and drought stress.

These cascading impacts stem from a prolonged shortage of precipitation in recent years (Figure 1a). Precipitation around Tehran typically peaks between December and April, replenishing reservoirs behind dams before the onset of the dry summer. Over the past five years, precipitation during this wet period has remained consistently below the long-term climatological baseline, with the 2024-25 season showing the most pronounced and prolonged deficit across the entire rainy season. When such prolonged dryness was followed by an exceptionally hot summer, it amplified hydrological stress across the region.

Seasonal cycle of precipitation averaged over a 1°×1° region centered on Tehran, based on GPM IMERG Final Run (V07B) dataset: monthly means for 2000/01–2019/20 (black), 2020/21–2024/25 (blue) and 2024/25 (red).

Illustration: Yeonwoo Choi and Elfatih A.B. Eltahir/Bulletin of the Atomic Scientists

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Welcome to your guide to Pips, the latest game in the New York Times catalogue.

Released in August 2025, Pips puts a unique spin on dominoes, creating a fun single-player experience that could become your next daily gaming habit.

Currently, if you’re stuck, the game only offers to reveal the entire puzzle, forcing you to move on to the next difficulty level and start over. However, we have you covered! Below are piecemeal answers that will serve as hints so that you can find your way through each difficulty level.

How to play Pips

If you’ve ever played dominoes, you’ll have a passing familiarity with how Pips is played. As we’ve shared in our previous hints stories for Pips, the tiles, like dominoes, are placed vertically or horizontally and connect with each other. The main difference between a traditional game of dominoes and Pips is the color-coded conditions you have to address. The touching tiles don’t necessarily have to match.

The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible — and common — for only half a tile to be within a color-coded space.

Here are common examples you’ll run into across the difficulty levels:

  • Number: All the pips in this space must add up to the number.

  • Equal: Every domino half in this space must be the same number of pips.

  • Not Equal: Every domino half in this space must have a completely different number of pips.

  • Less than: Every domino half in this space must add up to less than the number.

  • Greater than: Every domino half in this space must add up to more than the number.

If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.

Easy difficulty hints, answers for May 28 Pips

Greater Than (4): Everything in this space must be greater than 4. The answer is 3-3, placed horizontally.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-0, placed horizontally.

Greater Than (2): Everything in this space must be greater than 2. The answer is 3-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 3-1, placed vertically; 2-1, placed vertically.

Equal (2): Everything in this space must be equal to 2. The answer is 2-2, placed horizontally.

Greater Than (6): Everything in this space must be greater than 6. The answer is 4-4, placed horizontally.

Medium difficulty hints, answers for May 28 Pips

Not Equal: Everything in this space must be different. The answer is 4-3, placed vertically; 5-5, placed vertically.

Number (5): Everything in this space must add up to 5. The answer is 5-5, placed vertically.

Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.

Equal (2): Everything in this space must be equal to 2. The answer is 5-2, placed horizontally; 2-2, placed horizontally.

Not Equal: Everything in this red space must be different. The answer is 5-6, placed vertically; 4-4, placed horizontally; 3-3, placed horizontally; 2-2, placed horizontally.

Hard difficulty hints, answers for May 28 Pips

Number (6): Everything in this space must add up to 6. The answer is 3-6, placed horizontally.

Equal (3): Everything in this space must be equal to 3. The answer is 3-6, placed horizontally; 3-3, placed vertically; 3-2, placed horizontally.

Greater Than (1): Everything in this space must be greater than 1. The answer is 3-2, placed horizontally.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically; 1-0, placed vertically.

Equal (0): Everything in this space must be equal to 0. The answer is 1-0, placed vertically; 0-0, placed horizontally.


Not Equal: Everything in this space must be different. The answer is 1-4, placed vertically; 3-0, placed vertically; 2-6, placed vertically.


Less Than (3): Everything in this space must be less than 3. The answer is 0-6, placed vertically.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-6, placed vertically.

Equal (6): Everything in this space must be equal to 6. The answer is 0-6, placed vertically; 4-6, placed vertically; 6-6, placed vertically; 6-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 1-3, placed vertically; 6-1, placed vertically; 1-1, placed vertically.

Number (3): Everything in this space must add up to 3. The answer is 1-3, placed vertically

If you’re looking for more puzzles, Mashable’s got games now! Check out our games hub for Mahjong, Sudoku, free crossword, and more.

#NYT #Pips #hints #answers">NYT Pips hints, answers for May 28, 2026
                                                            Welcome to your guide to Pips, the latest game in the New York Times catalogue.Released in August 2025, Pips puts a unique spin on dominoes, creating a fun single-player experience that could become your next daily gaming habit.Currently, if you’re stuck, the game only offers to reveal the entire puzzle, forcing you to move on to the next difficulty level and start over. However, we have you covered! Below are piecemeal answers that will serve as hints so that you can find your way through each difficulty level.How to play PipsIf you’ve ever played dominoes, you’ll have a passing familiarity with how Pips is played. As we’ve shared in our previous hints stories for Pips, the tiles, like dominoes, are placed vertically or horizontally and connect with each other. The main difference between a traditional game of dominoes and Pips is the color-coded conditions you have to address. The touching tiles don’t necessarily have to match.
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            Wordle today: Answer, hints for May 28, 2026
            
        
    
The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible — and common — for only half a tile to be within a color-coded space.Here are common examples you’ll run into across the difficulty levels:Number: All the pips in this space must add up to the number.Equal: Every domino half in this space must be the same number of pips.Not Equal: Every domino half in this space must have a completely different number of pips.Less than: Every domino half in this space must add up to less than the number.Greater than: Every domino half in this space must add up to more than the number.If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.
        SEE ALSO:
        
            NYT Strands hints, answers for May 28, 2026
            
        
    
Easy difficulty hints, answers for May 28 PipsGreater Than (4): Everything in this space must be greater than 4. The answer is 3-3, placed horizontally.Greater Than (3): Everything in this space must be greater than 3. The answer is 4-0, placed horizontally.Greater Than (2): Everything in this space must be greater than 2. The answer is 3-1, placed vertically.Equal (1): Everything in this space must be equal to 1. The answer is 3-1, placed vertically; 2-1, placed vertically.Equal (2): Everything in this space must be equal to 2. The answer is 2-2, placed horizontally.Greater Than (6): Everything in this space must be greater than 6. The answer is 4-4, placed horizontally.
        
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Medium difficulty hints, answers for May 28 PipsNot Equal: Everything in this space must be different. The answer is 4-3, placed vertically; 5-5, placed vertically.Number (5): Everything in this space must add up to 5. The answer is 5-5, placed vertically.Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.Equal (2): Everything in this space must be equal to 2. The answer is 5-2, placed horizontally; 2-2, placed horizontally.Not Equal: Everything in this red space must be different. The answer is 5-6, placed vertically; 4-4, placed horizontally; 3-3, placed horizontally; 2-2, placed horizontally.Hard difficulty hints, answers for May 28 PipsNumber (6): Everything in this space must add up to 6. The answer is 3-6, placed horizontally.Equal (3): Everything in this space must be equal to 3. The answer is 3-6, placed horizontally; 3-3, placed vertically; 3-2, placed horizontally.Greater Than (1): Everything in this space must be greater than 1. The answer is 3-2, placed horizontally.Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically.Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically; 1-0, placed vertically.Equal (0): Everything in this space must be equal to 0. The answer is 1-0, placed vertically; 0-0, placed horizontally.Not Equal: Everything in this space must be different. The answer is 1-4, placed vertically; 3-0, placed vertically; 2-6, placed vertically.Less Than (3): Everything in this space must be less than 3. The answer is 0-6, placed vertically.Greater Than (3): Everything in this space must be greater than 3. The answer is 4-6, placed vertically.Equal (6): Everything in this space must be equal to 6. The answer is 0-6, placed vertically; 4-6, placed vertically; 6-6, placed vertically; 6-1, placed vertically.Equal (1): Everything in this space must be equal to 1. The answer is 1-3, placed vertically; 6-1, placed vertically; 1-1, placed vertically.Number (3): Everything in this space must add up to 3. The answer is 1-3, placed verticallyIf you’re looking for more puzzles, Mashable’s got games now! Check out our games hub for Mahjong, Sudoku, free crossword, and more.

                    
                                            
                            
                        
                                    #NYT #Pips #hints #answers

New York Times catalogue.

Released in August 2025, Pips puts a unique spin on dominoes, creating a fun single-player experience that could become your next daily gaming habit.

Currently, if you’re stuck, the game only offers to reveal the entire puzzle, forcing you to move on to the next difficulty level and start over. However, we have you covered! Below are piecemeal answers that will serve as hints so that you can find your way through each difficulty level.

How to play Pips

If you’ve ever played dominoes, you’ll have a passing familiarity with how Pips is played. As we’ve shared in our previous hints stories for Pips, the tiles, like dominoes, are placed vertically or horizontally and connect with each other. The main difference between a traditional game of dominoes and Pips is the color-coded conditions you have to address. The touching tiles don’t necessarily have to match.

The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible — and common — for only half a tile to be within a color-coded space.

Here are common examples you’ll run into across the difficulty levels:

  • Number: All the pips in this space must add up to the number.

  • Equal: Every domino half in this space must be the same number of pips.

  • Not Equal: Every domino half in this space must have a completely different number of pips.

  • Less than: Every domino half in this space must add up to less than the number.

  • Greater than: Every domino half in this space must add up to more than the number.

If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.

Easy difficulty hints, answers for May 28 Pips

Greater Than (4): Everything in this space must be greater than 4. The answer is 3-3, placed horizontally.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-0, placed horizontally.

Greater Than (2): Everything in this space must be greater than 2. The answer is 3-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 3-1, placed vertically; 2-1, placed vertically.

Equal (2): Everything in this space must be equal to 2. The answer is 2-2, placed horizontally.

Greater Than (6): Everything in this space must be greater than 6. The answer is 4-4, placed horizontally.

Medium difficulty hints, answers for May 28 Pips

Not Equal: Everything in this space must be different. The answer is 4-3, placed vertically; 5-5, placed vertically.

Number (5): Everything in this space must add up to 5. The answer is 5-5, placed vertically.

Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.

Equal (2): Everything in this space must be equal to 2. The answer is 5-2, placed horizontally; 2-2, placed horizontally.

Not Equal: Everything in this red space must be different. The answer is 5-6, placed vertically; 4-4, placed horizontally; 3-3, placed horizontally; 2-2, placed horizontally.

Hard difficulty hints, answers for May 28 Pips

Number (6): Everything in this space must add up to 6. The answer is 3-6, placed horizontally.

Equal (3): Everything in this space must be equal to 3. The answer is 3-6, placed horizontally; 3-3, placed vertically; 3-2, placed horizontally.

Greater Than (1): Everything in this space must be greater than 1. The answer is 3-2, placed horizontally.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically; 1-0, placed vertically.

Equal (0): Everything in this space must be equal to 0. The answer is 1-0, placed vertically; 0-0, placed horizontally.


Not Equal: Everything in this space must be different. The answer is 1-4, placed vertically; 3-0, placed vertically; 2-6, placed vertically.


Less Than (3): Everything in this space must be less than 3. The answer is 0-6, placed vertically.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-6, placed vertically.

Equal (6): Everything in this space must be equal to 6. The answer is 0-6, placed vertically; 4-6, placed vertically; 6-6, placed vertically; 6-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 1-3, placed vertically; 6-1, placed vertically; 1-1, placed vertically.

Number (3): Everything in this space must add up to 3. The answer is 1-3, placed vertically

If you’re looking for more puzzles, Mashable’s got games now! Check out our games hub for Mahjong, Sudoku, free crossword, and more.

#NYT #Pips #hints #answers">NYT Pips hints, answers for May 28, 2026

Welcome to your guide to Pips, the latest game in the New York Times catalogue.

Released in August 2025, Pips puts a unique spin on dominoes, creating a fun single-player experience that could become your next daily gaming habit.

Currently, if you’re stuck, the game only offers to reveal the entire puzzle, forcing you to move on to the next difficulty level and start over. However, we have you covered! Below are piecemeal answers that will serve as hints so that you can find your way through each difficulty level.

How to play Pips

If you’ve ever played dominoes, you’ll have a passing familiarity with how Pips is played. As we’ve shared in our previous hints stories for Pips, the tiles, like dominoes, are placed vertically or horizontally and connect with each other. The main difference between a traditional game of dominoes and Pips is the color-coded conditions you have to address. The touching tiles don’t necessarily have to match.

The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible — and common — for only half a tile to be within a color-coded space.

Here are common examples you’ll run into across the difficulty levels:

  • Number: All the pips in this space must add up to the number.

  • Equal: Every domino half in this space must be the same number of pips.

  • Not Equal: Every domino half in this space must have a completely different number of pips.

  • Less than: Every domino half in this space must add up to less than the number.

  • Greater than: Every domino half in this space must add up to more than the number.

If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.

Easy difficulty hints, answers for May 28 Pips

Greater Than (4): Everything in this space must be greater than 4. The answer is 3-3, placed horizontally.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-0, placed horizontally.

Greater Than (2): Everything in this space must be greater than 2. The answer is 3-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 3-1, placed vertically; 2-1, placed vertically.

Equal (2): Everything in this space must be equal to 2. The answer is 2-2, placed horizontally.

Greater Than (6): Everything in this space must be greater than 6. The answer is 4-4, placed horizontally.

Medium difficulty hints, answers for May 28 Pips

Not Equal: Everything in this space must be different. The answer is 4-3, placed vertically; 5-5, placed vertically.

Number (5): Everything in this space must add up to 5. The answer is 5-5, placed vertically.

Number (4): Everything in this space must add up to 4. The answer is 4-4, placed horizontally.

Equal (2): Everything in this space must be equal to 2. The answer is 5-2, placed horizontally; 2-2, placed horizontally.

Not Equal: Everything in this red space must be different. The answer is 5-6, placed vertically; 4-4, placed horizontally; 3-3, placed horizontally; 2-2, placed horizontally.

Hard difficulty hints, answers for May 28 Pips

Number (6): Everything in this space must add up to 6. The answer is 3-6, placed horizontally.

Equal (3): Everything in this space must be equal to 3. The answer is 3-6, placed horizontally; 3-3, placed vertically; 3-2, placed horizontally.

Greater Than (1): Everything in this space must be greater than 1. The answer is 3-2, placed horizontally.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically.

Number (6): Everything in this space must add up to 6. The answer is 6-5, placed vertically; 1-0, placed vertically.

Equal (0): Everything in this space must be equal to 0. The answer is 1-0, placed vertically; 0-0, placed horizontally.


Not Equal: Everything in this space must be different. The answer is 1-4, placed vertically; 3-0, placed vertically; 2-6, placed vertically.


Less Than (3): Everything in this space must be less than 3. The answer is 0-6, placed vertically.

Greater Than (3): Everything in this space must be greater than 3. The answer is 4-6, placed vertically.

Equal (6): Everything in this space must be equal to 6. The answer is 0-6, placed vertically; 4-6, placed vertically; 6-6, placed vertically; 6-1, placed vertically.

Equal (1): Everything in this space must be equal to 1. The answer is 1-3, placed vertically; 6-1, placed vertically; 1-1, placed vertically.

Number (3): Everything in this space must add up to 3. The answer is 1-3, placed vertically

If you’re looking for more puzzles, Mashable’s got games now! Check out our games hub for Mahjong, Sudoku, free crossword, and more.

#NYT #Pips #hints #answers

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