Birth control pills work great if women remember to take them every day…but missing doses can mean a surprise pregnancy. Now scientists have figured out how to pack a month’s supply into one capsule. The trick: a tiny star-shaped gadget that unfolds in the stomach and gradually releases the drug. The experimental capsule is still years away from drug-stores…but researchers are now reporting that it works as designed in a key test in animals. The Bill and Melinda Gates Foundation is investing 13-million dollars for further development of the once-a-month pill, in hopes of eventually improving family planning options in developing countries.