Myasthenia gravis (MG) is a rare, chronic autoimmune disorder that disrupts the communication between nerves and muscles. It ...

Shares of Archer Aviation ( ACHR 22.03%) are surging on Tuesday. The company's stock gained 22.7% as of 2:11 p.m. ET and was up as much as 26.7% earlier in the day. The jump comes as the S&P 500 ( ...