We cannot see ultraviolet (UV) light but it can have hazardous effects on the human body. Ultraviolet light in sunlight can cause the skin to tan or burn. Fluorescent substances are used in energy ...

Discovered in the 18th century, the Helix Nebula, located about 700 light-years away in the constellation Aquarius, belongs ...

The flowers, which grow at the top of long, one- to three-meter stems, appear to us to be somewhat uniform, with bright yellow rings of petals adorning brown irises. But bees and other ...