These were the most popular (by number of page views) posts on our blog in 2015.

• Monitor-Merrimac Memorial Bridge-Tunnel (2008)
• 3D Printing at Home: Today, Challenges and Opportunities (2015)

Taco Shell Holder, Noah Hornberger had the idea during breakfast and printed a version to test the next day.

• Why is it Colder at Higher Elevations? (2008)
• Top Countries for Science and Math Education: Finland, Hong Kong and Korea (2010 – showing 2009 PISA results, related: Math Education Results Show China, Singapore, Korea and Japan Leading (2014 -showing 2012 PISA results)
• Nanotechnology Breakthroughs for Computer Chips (2007)
• Molten Salt Solar Reactor Approved by California (2010)
• Science Sort of Explains: Hiccups (2008)
• Science Toys You Can Make With Your Kids (2005)
• Albert Einstein, Marilyn Monroe Hybrid Image (2009)
• Loan Forgiveness Program for Engineering Students (2008)
• Science and Optical Illusions (2010)
• Ranking Countries by Scientific Publication Citations: USA, UK, Germany… (2015)
• S&P 500 CEO’s: Engineering is the Most Common Major (2009)
• 59 MPG Toyota iQ Diesel Available in Europe (2008)
• How Lysozyme Protein in Our Tear-Drops Kill Bacteria (2012)
• Home Halloween Engineering: Gaping Hole Costume (2010)
• 2009 Nobel Prize in Chemistry: the Structure and Function of the Ribosome (2009)
• Using Bacteria to Carry Nanoparticles Into Cells (2007)

• Underwater Pedestrian Walkway (2011)
• Lexus Has Built a Working Hoverboard (2015)

This list shows how popular old posts can remain over time. 12 of these were also in the top 20 in 2014, 8 are new to the list this year. 3 of those are 2015 posts, in 2014 1 post from 2014 made the top 20. The distribution over the years of publication of the posts in the list this year:

2015: 3

2012: 1
2011: 1
2010: 4
2009: 3
2008: 5
2007: 2

2005: 1