How Lactobacillus helps protect the vagina from infection

Helpful vaginal bacteria can block infections

Lactobacillus bacteria help protect the vagina from infection by making substances that keep harmful microbes under control. When these helpful bacteria are lost or disturbed, problems such as bacterial vaginosis and yeast infections become more likely.

Radio let navies talk farther — and be tracked

Radio gave ships longer-range communication, but direction finding could detect and track their signals. Navies kept signal lamps for times when they needed radio silence, including when ships replenished supplies at close range.

A star’s tiny shift showed that Earth moves around the Sun

As Earth moves around the Sun, nearby stars appear to shift slightly against more distant stars. Friedrich Bessel measured this effect in 1838, giving the first direct experimental proof that Earth moves around the Sun.

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How Lactobacillus helps protect the vagina from infection

Helpful vaginal bacteria can block infections

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