Do Not Overdose on Vitamin D

Do Not Overdose on Vitamin D

My report on Low Vitamin D Can Increase Risk for and Severity of COVID-19 neglected to include a caution about taking excessive amounts of vitamin D in pills or by injection. You cannot be poisoned by vitamin D through sun exposure or diet alone, but vitamin D...
Bicycles Are Most Energy Efficient

Bicycles Are Most Energy Efficient

A positive outcome of the many COVID-19 restrictions has been a huge boom in bicycling (New York Times, August 17, 2020). If you are a regular cyclist or are new to the sport, be proud. Humans riding on bicycles are more energy-efficient than any other form of...
Bicycles Are Most Energy Efficient

Why Humans Can Run Marathons and Apes Cannot

Extensive research by Dr. Ajit Varki at UC/San Diego suggest that 2-3 million years ago, our pre-human ancestors had a single genetic mutation that could explain why humans can outrun their primate relatives (J Biol Chem, 1998;273:15 866-871). Most other mammals did...