On this Valentine's Day, watch a video about certain chemicals - including dopamine, oxytocin and vasopressin - making you feel good around someone you love.
Chuck Yeager, a military test pilot, became the first to break the sound barrier on October 14, 1947. Afterwards, he was dubbed "the fastest man alive."
The technologies needed to plan for dinner on Mars will also help us transform how things are done here on Earth, where 1/3 of all food is thrown away.