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President-elect Biden has an aggressive Day 1 immigration agenda that relies heavily on executive actions to undo President Trump's crackdown.

Why it matters: It's not that easy. Trump issued more than 400 executive actions on immigration. Advocates are fired up. The Supreme Court could threaten the Deferred Action for Childhood Arrivals (DACA) program, and experts warn there could be another surge at the border.

This fascinating map is made by Alasdair Rae of Sheffield, England, a former professor of urban studies who is the founder of Automatic Knowledge. It shows world population density in 3D.

Details: "No land is shown on the map, only the locations where people actually live. ... The higher the spike, the more people live in an area. Where there are no spikes, there are no people (e.g. you can clearly identify ... the Sahara Desert)."

The COVID-19 pandemic has thrown the NFL season into chaos, with all Denver Broncos quarterbacks sidelined, the San Francisco 49ers left without a home or practice ground and much of the Baltimore Ravens team unavailable, per AP.

Driving the news: The Broncos confirmed in a statement Saturday night that quarterbacks Drew Lock, Brett Rypien and Blake Bortles were identified as "high-risk COVID-19 close contacts" and will follow the NFL's mandatory five-day quarantine, making them ineligible for Sunday's game against New Orleans.

1. Health: WHO: AstraZeneca vaccine must be evaluated on "more than a press release."
2. Politics: McConnell temporarily halts in-person lunches for GOP caucus — Colorado Governor and partner test positive.
3. Economy: Safety nets to disappear in December — Amazon hires 1,400 workers a day throughout pandemic.
4. Education: U.S. public school enrollment drops as pandemic persists.
5. Cities: Surge in cases forces San Francisco to impose curfew — Los Angeles County issues stay-at-home order, limits gatherings.
6. Sports: NFL bans in-person team activities Monday as crisis engulfs league, Tuesday due to COVID-19 surge — NBA announces new coronavirus protocols.
7. World: London police arrest more than 150 during anti-lockdown protests — Thailand, Philippines sign deal with AstraZeneca for vaccine.

Tony Hsieh, the longtime ex-chief executive of Zappos, died on Friday after being injured in a house fire, his lawyer told the Las Vegas Review-Journal. He was 46.

The big picture: Hsieh was known for his unique approach to management, and following the 2008 recession his ongoing investment and efforts to revitalize the downtown Las Vegas area.

Airbnb and DoorDash plan to go public in the next few weeks, capping off a very busy year for IPOs.

What's next: You ain't seen nothing yet.