Technology
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Background: When an action is routine and uninteresting (e.g. locking a door, turning off a light, etc.), it’s sometimes hard to remember if you did it at all. The issue: Occasionally, people find themselves wondering “did I close the garage when I left the house?” or “did I remember to lock the car when I…
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Background: It is well known that washing hands for a surprisingly long time (30 seconds!) substantially reduces microbial contamination (Figure W1). The issue: Unfortunately, people generally feel, psychologically speaking, that their hands are clean immediately upon rinsing them with even the slightest hint of water. The challenge, therefore, is to encourage people to wash…
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Background: Modern submarines use a periscope-like electronic camera (a “photonics mast.”) to view the world above the waves. The issue: The problem is twofold: If an adversary spots a periscope, there isn’t much doubt as to what’s under the waves: it’s a submarine (Figure 1). Periscope designs are apparently specific to each nation, so just…
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Background: In programming, there is the notion of “code smell”—a subtle indication that something is terribly wrong in a piece of source code, but without any (obvious) actual mistake. For example, if you saw the following: print(“E”); print(“RR”); print(“OR”); print(“!”); instead of print(“ERROR!”); that would be a good indication that something extremely bizarre was going…
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Background: In many cities, there are a large number of “almost-a-parking-spot” locations (for example, between two driveways) that can only fit an extremely small car. Additionally, most popular models of small cars have gotten substantially larger over time. For example, a 1959 Mini Cooper is 120 inches long, while a 2005 model is 143 inches…
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Background: Laptop privacy screens (or “monitor filters”) reduce the viewing angle of a laptop screen in order to prevent evildoers from snooping on sensitive information on your laptop (Figure 1). The issue: Unfortunately, these privacy screens have a few downsides: They are inelegant to attach. Often, the attachment points block a small amount of screen…
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When using a computer, phone, or tablet, it is occasionally the case that a user must type in numbers. Typing numbers on a computer with a 12-digit physical numeric keypad is fast and easy (Figure 1). Unfortunately, laptops frequently no longer have these hardware keypads, and smartphones and tablets never did. The issue: The “soft”…



