
Roman Concrete Was Better Than Modern Equivalents
Ancient Roman concrete could self-heal thanks to “hot mixing” with quicklime.

Ancient Roman concrete could self-heal thanks to “hot mixing” with quicklime.

Explore common strategies to help you process this emotional experience.

Take the Harvard implicit bias test here. Everyone has implicit biases – thoughts and feelings outside your conscious awareness and control which influence your decisions. Once you’re aware of them, you can start taking steps to address them.

STEM Professionals in Schools is a national volunteer program that facilitates partnerships between schools and industry to bring real STEM (Science, Technology, Engineering and Maths) into the classroom.


“Singing” ice, a seal that sounds like it is in space, and a seismic airgun thundering like a bomb are some of the noises released by two marine acoustic labs.

The first regulatory submission for a CRISPR-based therapy has been validated by the European Medicines Agency, to treat sickle cell disease and transfusion-dependent beta thalassemia.

High-profile COVID-19 retractions raised concerns about data oversight in 2020 and in 2021 the retracted studies are still being routinely cited.