Reservoir of water hides high above Earth Earth's upper atmosphere holds a surprising amount of water. Ancient human saunters into limelight Fossilized footprints on the shore of a South African lagoon were left about 117,000 years ago by an anatomically modern human. South African Journal of Science September. Neandertals make big splash in gene pool. Bower, B. 1997.
Early humans make their marks as hunters.
Consuming additional calcium does little to reverse bone density loss in women who are breast-feeding their babies. The effect of calcium supplementation on bone density during lactation and after weaning. Prentice, A. 1997. Calcium supplementation during breast-feeding. Report of the Institute of Medicine.