Covid Live Updates: Drive to Vaccinate Children Gathers Speed in U.S.

who are fully vaccinated against the coronavirus to drop mask wearing in most situations, some states lifted mask mandates, while others took a more cautious approach.

“We have all longed for this moment,” Dr. Rochelle P. Walensky, the C.D.C. director, said at a White House news conference on Thursday. “If you are fully vaccinated, you can start doing the things that you had stopped doing because of the pandemic.”

Most of the state officials who responded to the shift were Democrats. Half of the country’s governors — most of them Republicans — had already lifted mask mandates in some form. …

Poison Ivy: What You May Not Know

The adage “leaflets three, let it be” is a good start in identification. Except in rare, five-leaflet populations in Massachusetts and Texas, poison ivy’s leaflets are arranged in threes. But the plant can otherwise be so morphologically variable that it confounds all but expert observers.

“Its plasticity is really crazy,” Ms. Pell said. And that has led to distinctive-looking phenotypes in different regions being designated as local species.

She begs to differ. As part of her long collaboration with John D. Mitchell, honorary curator at New York Botanical Garden, Ms. Pell has been sorting it out. …

Conflict Between Israel and Palestinians Continues to Escalate

JERUSALEM — A new front opened in the military showdown between the Israeli Army and Palestinian militants in Gaza on Wednesday as a wave of mob violence between Jews and Arabs spread across several Israeli cities, leading to riots and attacks in the streets as rockets and missiles streaked across the sky.

Israel said it assassinated 10 senior militants and continued to pound both military and residential areas across the Gaza Strip with airstrikes, while Hamas, the Islamist group that rules Gaza, and its allies continued to fire rockets into civilian areas across central and southern Israel.

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