Todd Helmenstine


About Todd Helmenstine

Todd Helmenstine is the physicist/mathematician who creates most of the images and PDF files found on sciencenotes.org. Nearly all of the graphics are created in Adobe Illustrator, Fireworks and Photoshop. Todd also writes many of the example problems and general news articles found on the site.


Natural Disaster Word Search
Mother nature has a variety of ways to cause trouble. This natural disasters word search puzzle lists a few of her tricks. Find the natural disaster words from the list either forward or backward in vertical, horizontal, and diagonal directions.  The puzzle is optimized to fit on a standard 8.5″x11″ […]

Natural Disasters Word Search


Word search puzzles are a fun way to learn glossary terms for a subject. This word search has a hot set of glossary terms dealing with volcanos and vulcanology. Find volcano-themed words from the list forward or backward in vertical, horizontal, and diagonal directions.  The puzzle is optimized to fit […]

Volcano Word Search


Astronomy Word Search DBL
Word search puzzles are a fun way to learn glossary terms for a subject. This word search has an out-of-this-world set of glossary terms dealing with astronomy. Find astronomy-themed words from the list in vertical, horizontal, and diagonal directions.  The puzzle is optimized to fit on a standard 8.5″x11″ sheet […]

Astronomy Word Search Puzzle



Rita Levi-Montalcini
April 22 is Rita Levi-Montalcini’s birthday. Levi-Montalcini was an Italian neurologist who made several discoveries of how cells divide and form new cells with different functionality. Levi-Montalcini began her career in science wanting to be a doctor. She graduated with an M.D. from the University of Turin in 1936 and took a […]

Today in Science History – April 22 – Rita Levi-Montalcini


Percy Williams Bridgman
April 21 is Percy W. Bridgman’s birthday. Bridgman was an American physicist known for his work in high-pressure physics. Bridgman began his career studying the effects of high pressure on matter as a professor at Harvard. During a repair of his equipment, he came up with an idea to improve the seal […]

Today in Science History – April 21 – Percy W. ...


Franz Karl Achard
April 20 marks the passing of Franz Karl Achard. Archard was a French natural philosopher who discovered how to get sugar from beets on an industrial scale. Napoleon’s defeat in Egypt caused the British navy to embargo cargo from reaching French ports. Any cargo ship which challenged this found their ship […]

Today in Science History – April 20 – Franz Karl ...