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This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. Saliva contains many useful components: lubricants, enzymes for breaking down food and now compounds that can reveal a persons age. Thats according to a

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The planet also began releasing oxygen, thanks to an ancient adoption of photosynthesis. A very ancestral primitive plant cell either engulfed or tried to digest or surrounded a cyanobaterium and instead of digesting it, it actually became an organ w

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学英语单词

Adelie

affectionately

Agmar

alemite grease fitting

arsenical kefir

barrels per stream day

brass Brayton cycle

brottons

Call-A-Matic telephone set

cetiedil

chromosome fiber