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How can hummingbirds fly upside-down and backwards? asks a reader. Hummingbirds use enormous amounts of energy simply being themselves. When a hummingbird is sitting quietly on a branch, its heart beats a staccato 550 times a minute. When a bird is engaged in aerial acrobatics, its [...] How do dogs smell things we can’t? asks Olivia Minogue, a student in Sayville, NY. Sniff sniff sniff. You can actually see a dog’s nose hard at work, picking up a scent wafting through the air, following the invisible trail a rabbit left in the yard, or investigating your pants leg for evidence of a [...] |
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