A number of personal attributes allow others to guess someone's age — the lines on a face, the erectness of carriage, the color of hair. The voice also signals how old a speaker is. Your voice's sound ...

I have a secret power: I'm the allergy canary. About a week before the high pollen levels in Washington, D.C., burst forth, my body feels it! My nose is stuffed, my eyes tickle and itch — and my voice ...