Since we inherit our parents’ genes, how come our sisters and brothers don’t look exactly like us? How come we sometimes look more like our grandparents?
No one could explain heredity at all until a monk started studying pea plants. Nowadays, though, we can see exactly what's happening as living things put some of their genes, but not others, into the cells that become their offspring.
We're facing the next chapter of space exploration, and humans will travel deeper into the solar system than ever before.
Investigate the role commercial ventures play, new vehicles and technologies, and what experts say about meeting the challenges of exploring destinations beyond low Earth orbit.
Imagine you’re sick or injured, but far from the kind of health care you need. Not long ago, you’d have been out of luck.
But now, thanks to computer links and robots, a doctor can examine you, analyze your blood, even operate on you, from miles or even thousands of miles away. Welcome to the new world of telemedicine.
When an American chemist discovered a century ago that radioactive uranium in rock formations decayed into lead, he gave scientists a tool they’ve been using ever since.
Examine how this scientific breakthrough led to better calibrating the age of the Earth and its geologic history in the Grand Canyon and throughout the world.