Tens of millions of Americans take nutritional supplements. New studies allege some pills do not contain what is on the label. Other research indicates consumers may be ingesting too many vitamins. New concerns about dietary supplements.
Every year, millions of monarch butterflies migrate from Canada and the northeastern United States to one 50-acre plot in Mexico. Scientists still don’t fully understand how and why the butterflies return to the same spot year after year. Sue Halpern writes about this enduring mystery in her new book.
- Sue Halpern Author
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