Banned Books in School: Understanding the Controversy

Pen America releases its latest list of banned books in schools. Book banning is a contentious issue that has been going on for centuries. While some argue that certain books should be banned due to their controversial nature or the sensitive topics they cover, others believe everyone should have the right to access information and ideas freely.

Propeller advance paves way for quiet, efficient electric aviation

Electrification is seen as having an important role to play in the fossil-free aviation of tomorrow. But electric aviation is battling a dilemma: the more energy-efficient an electric aircraft is, the noisier it gets. Now, researchers at Chalmers University of Technology, Sweden, have developed a propeller design optimization method that paves the way for quiet, efficient electric aviation.