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chemical fossil
chemical fossil Any of various organic compounds found in ancient geological strata that appear to be biological in origin and are assumed to indicate that life existed when the rocks were formed. The presence of chemical fossils in Archaean strata indicates that life existed over 3500 million years... Read more |
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endospore
endospore The resting stage of certain bacteria, formed in response to adverse conditions. The bacterial cell changes into a partially dehydrated core, enclosed in a multilayered protein coat. On return to favourable conditions the spore germinates and reverts to the normal vegetative form of the... Read more |
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Holy Year
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leap year
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Sabbatical Year
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New Year
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roller skating
roller skating gliding on a hard, smooth, durable surface on skates with rollers or wheels, in recent years has become a popular adult sport. Skates mounted on wooden rollers date from the 1860s, and soon wooden wheels replaced the rollers. The ball-bearing skate wheel was invented in the 1880s.... Read more |
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cobalt
cobalt metallic chemical element; symbol Co; at. no. 27; at. wt. 58.9332; m.p. 1,495°C; b.p. about 2,870°C; sp. gr. 8.9 at 20°C; valence +2 or +3. Cobalt is a silver-white, lustrous, hard, brittle metal. It is a member of Group 9 of the periodic table . Like iron, it can be magnetized.... Read more |
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Hogmanay
Hogmanay in Scotland, New Year's Eve, and the celebrations that take place at this time. Also, a gift of cake etc. demanded by children at Hogmanay. The word is recorded from the early 17th century, and perhaps comes from an Anglo-Norman French form of Old French aguillanneuf ‘last day of... Read more |
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A Journal of the Plague Year
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