Science

Iran's government on Thursday made clear it has no interest in direct talks until the U.S. eases sanctions that have been squeezing Iran's economy. But the Obama administration isn't budging and says the ball is in the Iranians' court.

The suspicion that Iran wants to make a nuclear weapon is the rationale for the sanctions as well as for veiled threats of U.S. or Israeli military action if those sanctions fail.

Before they end up filleted and sautéed on your dinner plate, salmon lead some pretty extraordinary, globe-trotting lives.

After hatching in a freshwater stream, young salmon make a break for the ocean, where they hang out for years, covering thousands of miles before deciding its time to settle down and lay eggs in their natal stream.

So how do these fish find their way back to their home river?

The characteristics of gun violence in the U.S. are largely unknown because key federal health agencies have been banned from conducting such research since the mid-1990s.

President Obama, however, wants to change that.

Soup comes in many variations — chicken noodle, creamy tomato, potato and leek, to name a few. But through much of human history, soup was much simpler, requiring nothing more than boiling a haunch of meat or other chunk of food in water to create a warm, nourishing broth.

So who concocted that first bowl of soup?

Have you ever spent a couple of hours working on a craft project — or a presentation for work — and then fallen in love with what you've accomplished? Do the colors you've picked for your PowerPoint background pop so beautifully that you just have to sit back and admire your own genius?

If so, get in line: You're the latest person to fall victim to the Ikea Effect.

Guys, it may be time to get off the couch and hit the treadmill — especially if you want to have kids.

Okay, we all know that exercise is good for us. It can reduce the risk of obesity, diabetes and heart disease, to name a few benefits. Now researchers say physical activity may also help keep sperm healthy and happy.