Wednesday's inauguration ushered in new occupants of the White House, as well as a revamped White House website.

Shortly after President Biden and Vice President Kamala Harris took office, sharp-eyed Internet users noticed several major changes relating to the inclusivity and accessibility of the Executive Branch's official site. Among them are a new feature allowing users to include their pronouns when submitting contact forms and a relaunch of the Spanish-language website.

Back in April, COVID-19 hit the city of Manaus, Brazil, extremely hard. In fact, the outbreak there was arguably the worst anywhere in the world. One study, published in the journal Science, estimated that so many people were infected that the city could have reached herd immunity — that the outbreak there slowed down because up to 76% of the population had protection against the virus.

President Biden.

That's going to take some getting used to after these past four years.

The new president was sworn in Wednesday and made an inaugural address aimed at unity. Biden didn't sugarcoat, however, the hurdles to bringing Americans together, and he leaned into the challenges the U.S. faces, as he sees it.

Here are six takeaways from Biden's inauguration:

1. A starkly different tone was set.

Updated at 6:20 a.m. ET

A twin suicide bombing at a Baghdad market killed at least 28 people and injured 75 others on Thursday, Iraqi state media reports. At least seven people are still missing.

Two suicide bombers detonated their vests when security forces pursued them through the busy Tayaran square market. An interior ministry spokesman tweeted that the second bomber set off his device after people gathered around those dead and wounded from the first bombing.