Word: sunlight
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...Cretaceous period (136 million to 65 million years ago). No one knows exactly what killed the dinosaurs, although a radical change in environmental conditions seems a likely answer. One popular theory is that a huge meteor crashed to earth and kicked up such vast clouds of dust that sunlight was obscured and plants destroyed. Result: the dinosaurs starved to death...
Higher construction decreases the amount of sunlight on the streets, he said, in addition to changing the character of the city...
...Biochemistry near Munich, received his telephone call from Sweden, the champagne was readily at hand. Huber, 51, and fellow West Germans Johann Deisenhofer, 45, and Hartmut Michel, 40, were recognized for revealing the "atom by atom" structure of the molecule at the heart of photosynthesis, the process by which sunlight is converted into the chemical energy that fuels plant and animal life...
...speed for the descent into the atmosphere. Accounts of what happened next differ, but indications are that as the ship passed through a twilight region of space between day and night, an infrared sensor, which fixes the spacecraft's position in relation to earth, was confused by rays of sunlight. The unexpected signal caused the computer to abort the normal firing...
...crisis. One of the most troublesome elements in the garbage stream is the soaring use of plastic, which is difficult to burn or recycle and, because it is not biodegradable, will clog landfills for centuries. Early efforts to produce plastics that decay were less than successful: some disintegrated under sunlight, unavailable at the bottom of landfills. Others came apart after contact with water, causing supermarket executives to shudder at the thought of what would happen to the groceries in a plastic shopping bag containing a leaky milk bottle. But now there is a method of adding cornstarch to some plastics...