And what else you need to know today.

Some patients struggling with Covid-19 develop antibodies against their own tissues, scientists have found.

The 2019 killing appeared to be the country’s first political assassination by a far-right extremist since the end of World War II.

The E.U.’s vaccination crisis.

Demonstrators flooded the streets on Wednesday after the government abruptly announced that a ban on abortions for fetal abnormalities — virtually the only kind that had been allowed in Poland — would take effect.

The global competition to get vaccines.

Hoping to reduce the spread of the coronavirus variant, Britain announced on Wednesday it will require citizens arriving home from high-risk countries to quarantine in hotels for 10 days at their own expense.

Requiring that app makers list the data they collect reveals a lot about what some apps do with our information (ahem, WhatsApp) but creates confusion about others.

Slovenia’s government has replaced the directors of major institutions. But it says “run-of-the-mill artists really have nothing to complain about.”