August 27, 2023 - PBS News Weekend full episode

One million Americans live with Parkinson’s disease, a progressive condition that causes problems with body movement. New research has identified a genetic variant that increases the risk of Parkinson’s in people of African descent, and is not seen in those with European ancestry. Ekemini Riley, managing director of Aligning Science Across Parkinson's, joins John Yang to discuss the findings.

The effects of climate change have been hard to miss across North America and Europe this summer: record heat, wildfires and warming oceans. There are also other, less obvious consequences that affect both the quantity and quality of food crops. Climate change scientist Jonas Jägermeyr joins John Yang to explain the relationship between climate change and global food supply.

According to the Skin Cancer Foundation, everyone older than six months should use sunscreen every day to decrease the risk of skin cancer. But today’s sunblock is full of ingredients that are decades old and increasingly obsolete. Dr. Rita Linkner, a board-certified dermatologist, joins Ali Rogin to discuss the state of American sunscreen.