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James and Margret Reed of the Donner Party
James and Margret Reed of the Donner Party

The Donner Party was a group of American pioneers who set out for California in a wagon train, but became snowbound in the Sierra Nevada mountains in November 1846. Running out of food, some resorted to cannibalism to survive. The journey west usually took between four and six months, but the Donner Party had been slowed by following a new route called the Hastings Cutoff, which crossed the Rocky Mountains' Wasatch Range and the Great Salt Lake Desert in present-day Utah. They lost many cattle and wagons in the rugged terrain, and divisions formed within the group. Their food supplies ran low after they became trapped by an early, heavy snowfall high in the mountains. In mid-December some of the group set out on foot and were able to obtain help. Of the 87 members of the party, 48 survived to reach California. Historians have described the episode as one of the most spectacular tragedies in California history. (Full article...)

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In chemistry, an amino acid is a molecule containing both amine and carboxyl functional groups. In biochemistry, this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent.[1] In the alpha amino acids, the amino and carboxylate groups are attached to the same carbon, which is called the α–carbon. The various alpha amino acids differ in which side chain (R group) is attached to their alpha carbon. They can vary in size from just a hydrogen atom in glycine through a methyl group in alanine to a large heterocyclic group in tryptophan.

Beyond the amino acids that are found in all forms of life, many non-natural amino acids have vital roles in technology and industry. For example, the chelating agents EDTA and nitrilotriacetic acid are alpha amino acids that are important in the chemical industry. (more...)

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Royal Game of Ur board, c. 2500 BCE
Royal Game of Ur board, c. 2500 BCE

June 3: Martyrs Day in Uganda; King's Official Birthday in New Zealand (2024); Western Australia Day (2024)

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Laothoe populi

Laothoe populi, the poplar hawk-moth, is a moth of the family Sphingidae. The species is found throughout the Palearctic realm and the Near East, and is one of the most common members of the family in the region. On first hatching, the larvae are pale green with small yellow tubercules and a cream-coloured tail horn, at which point they are known as hornworms. They later develop yellow diagonal stripes on the sides, and pink spiracles. This photograph, taken in Saint-Quentin-en-Tourmont, France, shows a late instar of L. populi.

Photograph credit: Charles J. Sharp

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  1. ^ Proline is an exception to this general formula. It lacks the NH2 group because of the cyclization of the side chain.