Medical Science Using Groundbreaking Technology For Some Vaccines

The Whole Story with Anderson Cooper takes an inside look at the fatal conflict playing out between elephants and mankind in Sri Lanka. "Elephant Vs. Man" with CNN's Nick Paton Walsh premieres Sunday, April 21 at 8pm ET/PT.

CNN's Nick Paton Walsh reports from Sri Lanka in "Elephant Vs. Man" for The Whole Story with Anderson Cooper. The episode premieres Sunday, April 21 at 8pm ET/PT.

Israel has carried out a military strike inside Iran, a US official told CNN. Israel has not commented and Iran has not identified the source of the attack. Videos show flashes in the sky near the location of the strike. CNN cannot independently confirm the authenticity of those videos.

House members are lobbying Speaker Mike Johnson to raise the threshold to trigger the procedure to oust the speaker. However, Johnson announced he would not change the procedure for removing him from the speakership after Republican hardliners reacted with fury to the proposed change of rules. A single member can force a floor vote on the motion to vacate - part of the deal Kevin McCarthy made to become speaker last year.

Abas Aslani, an Iranian journalist and researcher based in Tehran, joins CNN's John Vause to discuss the atmosphere inside Iran after Israel's military strike.

Nigerian singer Simi shares with CNN's Larry Madowo how she balances her global stardom with her naturally introverted personality.