Letters from the December 18 & 25, 2004, issue of Science News
By Science News
Think fast
“Car deaths rise days after terror attacks” (SN: 10/9/04, p. 237: Car deaths rise days after terror attacks) mentions that the traffic volume was reduced following the attacks, yet fails to mention another likely factor in the increased deaths: Less traffic usually results in higher average speeds.
Del Dietrich
San Jose, Calif.
Our sun, the healer
I found your articles on vitamin D very interesting (“Vitamin Boost,” SN: 10/9/04, p. 232: Vitamin Boost; “Vitamin D: What’s Enough?” SN: 10/16/04, p. 248: Vitamin D: What’s Enough?). My question now is whether the rays received in a tanning bed can cause the skin to manufacture vitamin D.