Optical illusions are universally beloved for how they trick our brains and blow our minds. There's a reason we enjoy magic shows and Escher paintings and are mesmerized by fake oases in the desert. We love seeing things that bend our perceptions of reality, and the science behind the magic always proves fascinating as well.The Ames window is a pretty well-known optical illusion, but it's always cool to see. When spun, the angled window appears to oscillate back and forth instead of spin all the way around. But this video adds a twist that makes the effect even more mindbending—our brains simply can't process objective reality mixed with an optical illusion.The YouTube channel Curiosity Show explains the science of the illusion and gives a DIY demonstration for making your own Ames window. But wait until the pen gets taped to the window and spun. This is some real-life magic right here. Mind. Blown.This article originally appeared on 02.21.20

Everyone seems to have a theory on the best time to purchase airfare to save the most money. Some say it's right before take-off. Others will swear that prices are lowest six months before the flight. Well, now we have the truth. A scientific study was conducted by Expedia and the Airlines Reporting Commission that found the best times to buy flight tickets to get the best deal possible.When we actually buy...DOMESTIC: 32 DAYS IN ADVANCEINTERNATIONAL: 59 DAYS IN ADVANCEWhen we should buy...DOMESTIC: 57 DAYS IN ADVANCEThe ideal advance-purchase time for domestic flight to snag the lowest average airfare is 57 with prices climbing most rapidly in the 20 days leading up to the flight. On a flight that averages $496, it will cost $401 57 days before the flight and around $650 the day of departure.INTERNATIONAL: 171 DAYS IN ADVANCEFor a ticket that averages $1,368, the lowest average of $1,004 happens around 171 days before take-off. On the day of, the price will be around $1875. Ticket prices begin to dramatically escalate 75 days leading up to departure.(H/T Conde Nast Traveler)This article originally appeared on 10.14.15

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When done right, pigs in a blanket make you squeal with delight. However, some frozen options at the store are more likely to make you cry foul.