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Mayan Forestry
The early Maya culture practiced forest conservation – and may have paid a heavy price when …
Regrowing Coral
Researchers and volunteers are regrowing imperiled coral reefs by hand.
Rising Health Costs
Rising health care costs have slowed the growth of companies that subsidize employees' insurance.
Placebo Effect Genes
The placebo effect only works for certain people – could this be genetic?
Guinea Pigs
A listener asks why guinea pigs aren't often used as laboratory animals anymore.
Vitamin D Deficiency
Vitamin D deficiency in children has become extremely widespread.
Dog Intelligence
Dogs have similar cognitive abilities to two-year-old children.
Improving Geothermal
Chemical innovations could make geothermal power a bigger player in alternative energy.
Merkel Cells
Merkel cells in the fingertips and lips are responsible for our feeling of fine touch.
Diamonds & Extinction
What really killed North America's large mammals at the end of the last ice age?