Watch, Live, as Almost Nothing Happens

From Wikimedia Commons: Picture of the Pitch Drop Experiment from University of Queensland featuring the current (2007) custodian, John Mainstone (picture taken in 1990), two years into the life of the 8th drop.

On what is quite likely the most boring webcam ever, you can stare in rapt dumb awe as a drop of Australian pitch (a petroleum product used in waterproofing, among other things) very, very, very slowly drips out of a funnel. How slowly? Well, only eight drops of pitch have fallen since the experiment began in 1927. However, according to this table, the 8th drop fell on November 28, 2000 (12.3 years after the previous drop in 1988), so we're due for another drop any time in the next, oh, year or so. Or not. You see, the pitch drops are quite variable because the experiment is subject to changing room temperatures, and the installation of air conditioning in 1988 in the experiment's home building has really slowed things down.

This pitch funnel currently holds the Guinness World Record for the longest continuously-running experiment. There are two other notable experiments that almost make the grade -- the 1840 Oxford Electric Bell and 1864 Beverly Clock -- they haven't been running continuously, but nearly so. Better luck next time, Nineteenth Century scientists!

From The University of Queensland's page on the experiment:

The first Professor of Physics at the University of Queensland, Professor Thomas Parnell, began an experiment in 1927 to illustrate that everyday materials can exhibit quite surprising properties. The experiment demonstrates the fluidity and high viscosity of pitch, a derivative of tar once used for waterproofing boats. At room temperature pitch feels solid - even brittle - and can easily be shattered with a blow from a hammer. It's quite amazing then, to see that pitch at room temperature is actually fluid!

In 1927 Professor Parnell heated a sample of pitch and poured it into a glass funnel with a sealed stem. Three years were allowed for the pitch to settle, and in 1930 the sealed stem was cut. From that date on the pitch has slowly dripped out of the funnel - so slowly that now, 80 years later, the ninth drop is only just forming.

If that isn't exciting enough for you, go watch grass grow in real time (warning: plays sound). (Update, 10:30am Pacific: Mr. Grass has added red lawn chairs to the lawn; things are heating up!)

(Story via DVICE; Image courtesy of John Mainstone at The University of Queensland.)

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'Lime Disease' Could Give You a Nasty Rash This Summer
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A cold Corona or virgin margarita is best enjoyed by the pool, but watch where you’re squeezing those limes. As Slate illustrates in a new video, there’s a lesser-known “lime disease,” and it can give you a nasty skin rash if you’re not careful.

When lime juice comes into contact with your skin and is then exposed to UV rays, it can cause a chemical reaction that results in phytophotodermatitis. It looks a little like a poison ivy reaction or sun poisoning, and some of the symptoms include redness, blistering, and inflammation. It’s the same reaction caused by a corrosive sap on the giant hogweed, an invasive weed that’s spreading throughout the U.S.

"Lime disease" may sound random, but it’s a lot more common than you might think. Dermatologist Barry D. Goldman tells Slate he sees cases of the skin condition almost daily in the summer. Some people have even reported receiving second-degree burns as a result of the citric acid from lime juice. According to the Mayo Clinic, the chemical that causes phytophotodermatitis can also be found in wild parsnip, wild dill, wild parsley, buttercups, and other citrus fruits.

To play it safe, keep your limes confined to the great indoors or wash your hands with soap after handling the fruit. You can learn more about phytophotodermatitis by checking out Slate’s video below.

[h/t Slate]

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Why Eating From a Smaller Plate Might Not Be an Effective Dieting Trick 
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It might be time to rewrite the diet books. Israeli psychologists have cast doubt on the widespread belief that eating from smaller plates helps you control food portions and feel fuller, Scientific American reports.

Past studies have shown that this mind trick, called the Delboeuf illusion, influences the amount of food that people eat. In one 2012 study, participants who were given larger bowls ended up eating more soup overall than those given smaller bowls.

However, researchers from Ben-Gurion University in Negev, Israel, concluded in a study published in the journal Appetite that the effectiveness of the illusion depends on how empty your stomach is. The team of scientists studied two groups of participants: one that ate three hours before the experiment, and another that ate one hour prior. When participants were shown images of pizzas on serving trays of varying sizes, the group that hadn’t eaten in several hours was more accurate in assessing the size of pizzas. In other words, the hungrier they were, the less likely they were to be fooled by the different trays.

However, both groups were equally tricked by the illusion when they were asked to estimate the size of non-food objects, such as black circles inside of white circles and hubcaps within tires. Researchers say this demonstrates that motivational factors, like appetite, affects how we perceive food. The findings also dovetail with the results of an earlier study, which concluded that overweight people are less likely to fall for the illusion than people of a normal weight.

So go ahead and get a large plate every now and then. At the very least, it may save you a second trip to the buffet table.

[h/t Scientific American]

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