Archive for May 21st, 2012
SPELLING LIST
May 21
WE NEED YOUR HELP
May 21
JACK’S FACTS
May 21
This is Jack with Jack’s Facts and here is today’s fact. “Pound for pound, the hummingbird has the most powerful muscles of any animal. The muscles powering a hovering hummer’s wings “burn” 133 watts of power per kilogram of weight. Compare that to a marathon runner’s leg muscles, which use about 15 watts per kilogram.”
-Kathy Wollard
Author of How Come Planet Earth



