![MIT engineers make filters from tree branches to purify drinking water | MIT News | Massachusetts Institute of Technology MIT engineers make filters from tree branches to purify drinking water | MIT News | Massachusetts Institute of Technology](https://news.mit.edu/sites/default/files/styles/news_article__image_gallery/public/images/202103/MIT_Xylem-Filters-01-PRESS.jpg?itok=7ET89bkH)
MIT engineers make filters from tree branches to purify drinking water | MIT News | Massachusetts Institute of Technology
![Viol Ruina — 24dB resonant lowpass filter and distortion with envelope following in 4HP | Noise Engineering Viol Ruina — 24dB resonant lowpass filter and distortion with envelope following in 4HP | Noise Engineering](https://cdn.shopify.com/s/files/1/0552/0923/0485/products/viol-ruina-silver-1024x2048.png?v=1676493542&width=352&crop=center)
Viol Ruina — 24dB resonant lowpass filter and distortion with envelope following in 4HP | Noise Engineering
![Digital Filters (Dover Civil and Mechanical Engineering): Richard W. Hamming: 9780486650883: Amazon.com: Books Digital Filters (Dover Civil and Mechanical Engineering): Richard W. Hamming: 9780486650883: Amazon.com: Books](https://images-na.ssl-images-amazon.com/images/I/51DNh-HeJaL._AC_UL600_SR600,600_.jpg)
Digital Filters (Dover Civil and Mechanical Engineering): Richard W. Hamming: 9780486650883: Amazon.com: Books
![Engineers design a heated face mask to filter and inactivate coronaviruses | MIT News | Massachusetts Institute of Technology Engineers design a heated face mask to filter and inactivate coronaviruses | MIT News | Massachusetts Institute of Technology](https://news.mit.edu/sites/default/files/styles/news_article__image_gallery/public/images/202010/MIT-Covid-Mask-01-PRESS_0.jpg?itok=9Qmsn0Q7)