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Rapidly evolving SARS-Cov-2 strains may give rise to escape variants
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Early migrations of Siberians to America tracked using bacterial population structures
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UCLA: Number of COVID-19 Variants Growing Rapidly
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Early migrations of Siberians to America tracked using bacterial population structures
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May. 13, 2021 , 6:45 PM
Play a video of swimmer Michael Phelps in reverse, and you’ll notice right away that his stroke looks dramatically different running forward or backward in time. Such time asymmetry typifies the swimming motion of the vast majority of animals and it’s absolutely essential for bacteria and other microbes. But now, a team of physicists has developed a tiny mechanical swimmer that can inch along, even though its stroke is symmetric in time. The result opens a new conceptual lane in fluid dynamics and could aid in efforts to develop tiny swimming robots for drug delivery and other purposes.