The US and Canada have agreed to change a decades-old asylum agreement, putting more restrictions on migrants seeking protections in Canada. And, since the 9th century, monks, aristocrats and emperors have all tracked the date of "full flower" for cherry blossoms, providing an unusually complete record of spring coming earlier in Japan. Also, congressional leaders sparred with TikTok CEO Shou Zi Chew in Washington on Thursday, when Chew was on Capitol Hill to discuss TikTok's data security. The US is considering a ban on the the social media platform that is used by over 150 million Americans. Plus, sounds from the Brazilian 11-piece samba big band in Miami.