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Herakles and the hydra – Labors of Herakles

By |2018-04-23T10:07:40+00:00July 15th, 2017|Greeks, Literature|

Herakles fights the Hydra (Athenian red-figure vase, ca. 475 BC, Palermo, Sicily) King Eurystheus then told Herakles he had to go kill the Hydra for another one of his labors. The Hydra was a huge snake with seven heads. Hercules thought, "Well, that sounds easy. I'll just go cut off its heads with my sword." But when [...]

What is a hydra? Animal Biology and Evolution

By |2018-04-16T09:20:37+00:00May 28th, 2017|Biology|

Hydra evolution: a hydra budding new hydras For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. Early multi-cellular creatures Even today, the vast majority of the living things on earth are one-celled creatures - microbes. But about 600 million years ago, a few one-celled creatures began [...]

Reproductive System – Evolution and Biology

By |2018-04-16T08:57:39+00:00May 27th, 2017|Biology|

Reproduction: Hydra budding new hydras RNA and DNA molecules The first form of reproduction began about four billion years ago, when first RNA molecules and then DNA molecules began to make new copies of themselves by letting amino acids hook on to the parent molecule and then splitting them off. All reproduction since then [...]