• Smart and smarter drugs

    Are we asking the right questions about smart drugs? Marek Kohn looks at what they can do for us – and what they can’t.

  • Why do we have blood types?

    More than a century after their discovery, we still don’t really know what blood types are for. Do they really matter? Carl Zimmer investigates.

  • The mirror man

    Phantom pain, experienced in missing limbs, tortures amputees and puzzles scientists. Srinath Perur cycles round Cambodia with a man who treats it with mirrors.