06
Mar
killing the bad bacteria inside us
by cathybdouglas
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Large white blood cells called macrophages scooch through our bodies to absorb intrusive viruses and bacteria. The macrophage (means big eater) gobbles those unwanted intruders...
27
Feb
why there’s a leap year every 4 years
by cathybdouglas
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Our yearly calendar is based on the earth’s rotation & the time it takes to orbit the sun (365 days). But the orbit takes closer...
20
Feb
difference between ocean & sea
by cathybdouglas
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Oceans are huge bodies of salt water that separate continents–never knew this–and cover 70% of the planet earth. Seas are large bodies of salt water but...
05
Feb
the largest deserts on earth don’t have sand
by cathybdouglas
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Deserts cover about 33% of the earth’s land mass. But check this out. The hugest deserts in the world are “polar.” They’re not covered in...
27
Jan
pine trees hold world records
by cathybdouglas
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Guess what kind of tree is the tallest tree in the world? And the widest. And the oldest? Yep, all pine trees. According to basicbiology those titles...