Given a large beaker of water determine if these objects would sink or float in the water. styrofoam (D = .05 g/cm3)
ice (D = .92 g/cm3)
bone (D = 1.70 g/cm3)
balsa wood (D = 0.16 g/cm3)
gold (D = 19.32 g/cm3)

the answer is the

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

all eukaryotic cell have mitochondria : )