X-rays were discovered in 1895 by Wilhelm Conrad Röntgen. Since then, it has been an indispensable means of medicine. However, X-rays can lead to damage to the genetic material: In this video, we show how the body defends itself against it and what measures are taken by radiation protection. More i
The cosmic ray detector known as CREAM is headed for the International Space Station, with a goal of measuring the highest energy possible for direct measurement of high-energy cosmic rays. Visit http://science.nasa.gov/ for more. New Mission Going to the Space Station to Explore Mysteries of 'Cos
In the late 1960s, scientists accidentally discovered gamma-ray bursts — intense flashes of energy that typically last no more than a few minutes and are often as short as a fraction of a second. For decades after the discovery of these powerful bursts, they remained one of the greatest mysteries in
The Cartwrights come to the aid of a Chinese-American stable hand accused of murder. Opposing them is a manipulative mayoral candidate who wants all "foreigners" to leave Virginia City. After Hop Sing is beaten in Virginia City, the Cartwrights realize the prejudice against the Chinese in Californi
Lord and Lady Dunsford arrive at the Ponderosa to visit their old friend Ben. Adam finds himself the object of Lady Dunsford's attentions when she deems him to be a braver man than her husband. Adam then takes the couple on a hunting trip, where Lord Dunsford freezes while attempting to shoot a coug
About to set out on a cattle drive, Ben hires a young drifter named Sam Jackson as one of his drovers. What he doesn't know is that Jackson is really outlaw Johnny Logan, who signed on to the drive because he knew it was going to pass near the town of Waycross, and Logan is determined to kill the Wa
Adam is bushwhacked by three deserters from the Army who are hiding out on the Ponderosa. When Ben pursues them, he is hindered by a Captain Bolton, the arrogant commander of a military posse who is also after the men. Three army prisoners have escaped Ft Dayton. Mertz still has chains around his w
Adam rides up on some Indians wanting to harm a white woman they believed was a mountain spirit. He kills them but not before they wound him. The woman nurses him back to health but the rest of the tribe is still out there looking for her. While traveling, Adam is wounded by Indians and left for de
Adam, Hoss, and new friend Sam Board act as escorts for a wagon train of Quakers who are heading to California to purchase land for their settlement. While Adam falls for the group leader's daughter, Reginia, Board plots to rob the group of its life savings. A wagon train of Quakers from Ohio are p
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When 16-year-old Todd Grayson arrives from Boston to Virginia City, he is told that his father has been killed by Ben Cartwright. Ben shot Luke Grayson in self-defense, but Todd won't listen to this. The boy has only one thing in his head: to avenge his father by killing Ben Cartwright. The son of
Charlie Trent used to be an Army scout. Now he's the town drunk. Hoss helps him regain his self-esteem when he has him volunteer to lead a gold-bearing troop through the desert where there's very little water. An Army wagon train carrying gold is in Virginia City getting supplies. When their scout,
