Egg

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The geometrically elegant, conceptually simple chicken egg presents a challenge to those who want to deduce everything from the laws of physics: How can you determine whether there's life inside? Although there are straightforward ways to determine that certain things haven't killed potentially live cells in there, and whether conditions are consistent with cells being alive, it is remarkably difficult to make a positive determination. Physics also has not yet determined which came first, the chicken or the egg. (Unit: 9)