Most people now understand the need to protect their skin from too much sun. But what did people do before the invention of sunscreen? And do you know the difference between sunscreen and sun block?
Discover the history of sunscreen and sun block, learn about natural products to protect your skin and about modern innovations for skin protection.
For more than 400 million years, the chambered nautilus has propelled itself through ocean depths in search of prey. Like its squid and octopus relatives, it also has tentacles, but its shell makes it unique.
Investigate what else (besides the animal) is inside its many-chambered shell and how this very active predator uses it.
These insects provide summer background music using body parts as instruments. Individual species play distinctive songs, which you can use to identify them even if you can’t see them.
They belong to the same order, Orthoptera — along with locusts and katydids — but differ in physical features and behavior.
Sure, the Sun is one of billions of stars in the universe...but it's the ONLY one that makes life on Earth possible.
Take a closer look at this ball of gas held together by its own gravity — so huge a million Earths could fit inside it, and so hot that temperatures at it core are more than 27 million degrees Fahrenheit.
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