This episode originally aired on Oct. 27, 2020. The Byrd Polar and Climate Research Center at The Ohio State University has embarked on a fundraising campaign to preserve its collection of ice core samples for future generations of scientists. Like rings of a tree, the frozen cylinders provide a climatological record stretching back hundreds of thousands of years.

A number of states have been using mobile phone apps to track the spread of COVID 19. But the results have been uneven. The lack of a national approach has left a hodge-podge system that varies from state to state.

Drugmaker Pfizer announced Monday an experimental coronavirus vaccine shown to be more than 90% effective in early tests. The news came as the U.S passed a grim milestone, recording more than 10 million cases of COVID-19 since the beginning of the pandemic.

President-elect Joe Biden and Vice President-elect Kamala Harris plan to use the transition period to get started on priorities like getting the pandemic under control. But President Trump isn’t making it easy for the new administration. He continues to challenge the legitimacy of the election – on Twitter and in the courts.

President-elect Joe Biden and Vice President-elect Kamala Harris celebrated their historic win Saturday night in Wilmington, Delaware, as President Trump ramped up his legal defense and refused to concede. Ohio cemented its status as a Republican stronghold, again delivering an eight-point margin for the president, and flipping more counties red in the process.

This episode originally aired on Oct. 20, 2020. American voters don’t elect a president on November 3. They vote to decide which political party electors will cast their state’s vote in the Electoral College. The present system has been in place since 1804 and has come under increasing scrutiny because the process enables an election to the presidency without a majority of the popular vote. That’s how Donald Trump won in 2016.

The presidential race entered Friday morning without a clear winner, as key states continued to count votes. Former Vice President Joe Biden emerged with a 1,100 vote lead in Georgia, and President Trump’s tally in Pennsylvania continues to shrink. The president pressed his case in the courts in key states.

As if this nailbiter presidential election needed more drama, the race to 270 electoral votes for President Trump and vice president Joe Biden comes down to four battleground states. The vote totals are tightening and tensions are rising, as demonstrators in different cities take to the streets to chat “count the vote” and “stop the count.”

Democrat Joe Biden on Wednesday drew closer to the 270 electoral votes needed to win the presidency after flipping Wisconsin and Michigan, two battleground states Donald Trump won in 2016. Still, the 2020 election was not the “blue wave” Democrats had hoped for, and whichever candidate is the next president will lead a still deeply divided country.

Without a clear winner in the presidential race, the morning after Election Day offers no relief to the dread many Americans have been feeling for months. A recent survey by the American Psychological Association found that nearly 70% of U.S. adults, regardless of party affiliation, feel this year’s presidential election is a significant source of anxiety.