For thousands of years, people judged the temperature by how they felt. To check the heat of an oven, cooks put a hand into the oven. If the weather felt cold, people put on more clothes. Long, long…
How many times can you lift your best friend higher than your head? How many times can your best friend lift you? It doesn’t sound easy, but it is—and it’s fun, too. When you and your friend are…
A young grasshopper climbs upon a twig. For a long time the grasshopper holds on to the twig without moving. Then, a strange thing happens. The skin splits all along the grasshopper’s back….
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