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History
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Chess Puzzles | Brilliant Math & Science Wiki
The field of chess puzzles is extremely diverse. It includes practical exercises to train one's skills at the game, compositions to illustrate beauty and fun/themed challenges, recreational puzzles such as retrograde analysis, and mathematical puzzles related to chess. Solving these puzzles is a special case of combinatorial games. Practical exercises generally fall into one of two categories: tactics and analytics. Tactics Puzzles In tactics puzzles, a position is presented with a forcing line …
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Accumulation of DNA Damage in Hematopoietic Stem and Progenitor Cells during Human Aging
Accumulation of DNA damage leading to adult stem cell exhaustion has been proposed to be a principal mechanism of aging. Here we tested this hypothesis in healthy individuals of different ages by examining unrepaired DNA double-strand breaks (DSBs) ...
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Poland: Opposition parties sign deal for possible coalition
The coalition, led by Donald Tusk, will have to wait a couple of weeks for a vote in the lower house of parliament. The group of parties has put forward several plans, such as overturning the near-total ban on abortion.
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Wilson's Creek National Battlefield (U.S. National Park Service)
Wilson's Creek was the first major Civil War battle fought west of the Mississippi River, and the site of the death of Nathaniel Lyon, the first Union general killed in action. The costly Southern victory on August 10, 1861, focused national attention on the war in Missouri. Wilson’s Creek NB commemorates and interprets the battle within the context of the war in the Trans-Mississippi West.