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01
What is it that keeps us up so that we are not flat as pancakes?Up next
Nov 10, 1975
02
Why do we have to breathe?
Nov 11, 1975
03
The food we eat - where does it go?
Nov 12, 1975
04
How can we think, do different things, see and hear?
Nov 13, 1975
05
Now the whole body is almost finished!
Nov 14, 1975
