World Quantum Day is on April 14, a nod to 4.14, the rounded first digits of Planck’s constant. CNN's Katie Hunt explains the history behind the worldwide celebration of quantum science.
Video Ad Feedback
Why World Quantum Day is trending

World Quantum Day is on April 14, a nod to 4.14, the rounded first digits of Planck’s constant. CNN's Katie Hunt explains the history behind the worldwide celebration of quantum science. Discover more videos, including live streams and exclusive storytelling, on our Watch page.

1:16 • Source: CNN
Get Looped in 14 videos
World Quantum Day is on April 14, a nod to 4.14, the rounded first digits of Planck’s constant. CNN's Katie Hunt explains the history behind the worldwide celebration of quantum science.
Video Ad Feedback
Why World Quantum Day is trending
01:16
Now playing
• Source: CNN
The Texas teenager who fatally stabbed Austin Metcalf, a track athlete from a rival team during a high school meet, was convicted of murder and sentenced to 35 years in prison on Tuesday. CNN’s Jean Casarez breaks down the arguments made at the trial that led to Anthony’s conviction.
Video Ad Feedback
Why Karmelo Anthony is trending
01:40
Now playing
• Source: CNN
US annual inflation hit 4.2%, a three-year high, according to the latest Consumer Price Index from the Bureau of Labor Statistics. CNN's Alicia Wallace explains what economist are saying about the latest spike in inflation.
Video Ad Feedback
Why the CPI report is trending
01:00
Now playing
• Source: CNN
Rep. Nancy Mace (R-SC) came in fifth place in the primary for South Carolina governor on Tuesday. CNN's Dianne Gallagher explains why President Donald Trump's lack of support may have helped tank Mace's campaign.
Video Ad Feedback
Why Nancy Mace is trending
01:16
Now playing
• Source: CNN
On Monday, a federal judge voided President Donald Trump’s requirement of a $100,000 application fee for H-1B visas, which are used by companies to hire highly skilled foreign workers.
Video Ad Feedback
Why H-1B visa ruling is trending
01:01
Now playing
• Source: CNN
Vice President JD Vance, who leads the White House anti-fraud task force, announced Monday that he made a criminal referral to the Department of Justice against Minnesota Democratic Gov. Tim Walz and other state officials.
Video Ad Feedback
Why Tim Walz is trending
01:10
Now playing
• Source: CNN
President Donald Trump is the first sitting president to go to an NBA Finals game, after attending Game 3 in Madison Square Garden on Monday. CNN’s Hannah Keyser explains what it was like for fans in the storied arena with the president in attendance.
Video Ad Feedback
Why 'Trump booed at MSG' is trending
01:17
Now playing
• Source: CNN
Apple revealed Siri AI, the new AI version of its digital assistant during the Worldwide Developers Conference on Monday. CNN's Lisa Eadicicco breaks down the updates and lets you know when it's expected to launch.
Video Ad Feedback
Why Siri AI is trending
01:07
Now playing
• Source: CNN
Los Angeles council member Nithya Raman has overtaken reality TV star Spencer Pratt in the primary race for Los Angeles Mayor, but votes are still being counted. Whoever holds on to that second spot will face off against Mayor Karen Bass in November. CNN's Julia Vargas Jones explains why we still don't have a final election result.
Video Ad Feedback
Why Nithya Raman is trending
01:20
Now playing
• Source: CNN
Six people were injured in a stabbing at New York’s Penn Station Sunday evening, raising security concerns as the city is set to host the NBA Finals at Madison Square Garden which sits above the station. CNN's Mark Morales breaks down the extra security measures in place ahead of Monday's Game 3 as President Donald Trump is expected to be in attendance.
Video Ad Feedback
Why Penn station stabbing is trending
00:49
Now playing
• Source: CNN
Five astronauts were forced to seek shelter aboard a spacecraft attached to the International Space Station on Friday. CNN’s Jackie Wattles explains what caused the safety issue on the ISS.
Video Ad Feedback
Why ISS evacuation is trending
01:47
Now playing
• Source: CNN
A new NTSB report on the United Airlines flight that struck a light pole while landing at Newark Airport last month says the plane was just 19 feet above the New Jersey Turnpike. CNN's Pete Muntean explains what pilots are doing to avoid future incidents like this one.
Video Ad Feedback
Why United is trending
01:16
Now playing
• Source: CNN
The former national security adviser during President Donald Trump’s first term is expected to plead guilty to mishandling sensitive national security information. CNN's Katelyn Polantz explains what investigators found in Bolton's home that led the Justice Department to file charges.
Video Ad Feedback
Why John Bolton is trending
01:49
Now playing
• Source: CNN
For the first time in decades, a case of flesh-eating New World screwworm has been detected in the United States. CNN's Jacqueline Howard explains what the main threats are from a screwworm infestation, and what is being done to prevent its spread.
Video Ad Feedback
Why screwworm is trending
01:33
Now playing
• Source: CNN