The court decided four cases Monday, and three defied the usual ideological fissures.

Physician Louise Aronson treats patients who are in their 60s — as well as those who are older than 100. She writes about changing approaches to elder health care in her book Elderhood.

Many users now mix opioids with stimulants such as meth and cocaine. Researchers say efforts to get doctors to reduce opioid prescriptions may have driven some users to buy meth on the street instead.

The leaders are scheduled to meet on Thursday, according to Chinese and North Korean news agencies. The visit comes after stalled negotiations with President Trump.