FDA authorizes Pfizer booster shots for children ages 12 to 15.

Dr. Alok Patel, a physician at Stanford Children’s Health, discusses how this new approval will help in schools.

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GOP senator discusses tensions between Russia and Ukraine.

GOP senator discusses tensions between Russia and Ukraine.

ABC News' Linsey Davis speaks with North Dakota Sen. Kevin Cramer about a tentative bipartisan bill to aid Ukraine and deter a possible Russian invasion.

'Jeopardy!' champion: Winning 'requires knowing little about a lot'.

'Jeopardy!' champion: Winning 'requires knowing little about a lot'.

ABC News' Linsey Davis speaks with "Jeopardy!" champion Amy Schnieder about her record-breaking wins and her upcoming battle with former show champion Matt Amodio.

Bitcoin operation ignites debate around Pennsylvania coal mining waste.

Bitcoin operation ignites debate around Pennsylvania coal mining waste.

ABC News' Elizabeth Schulze visits a once dormant power plant now humming with crypto activity, which environmentalists warn creates pollution.

Daveed Diggs on 'Snowpiercer' season 3

Daveed Diggs on 'Snowpiercer' season 3

ABC News' Linsey Davis sits down with Daveed Diggs to discuss the action-packed thriller and his favorite moments filming the new season.

The Rundown: Top headlines today: Jan. 24, 2022

The Rundown: Top headlines today: Jan. 24, 2022

Stay up to date on the developing stories making headlines.