Start New Topic
Blog Statistics
  • Views: 443694
  • Articles: 95
  • Comments: 55
  • Status: Public
  • Who's Viewing: 1
  • Guest
1 Guest  0 Members
Posted by bio_man   March 8, 2018   142 views

Since pearls are made mostly of calcium carbonate, the acid found in vinegar, known as acetic acid, will definitely dissolve one over a period of time. The same dissolution would occur if an egg were placed in a glass of vinegar and left to sit - the egg shell would disintegrate. Of course, the speed as which the pearl dissolves will depend on the concentration of the acid and the pearl's overall size. The reaction produces calcium acetate, water and carbon dioxide, summarized below:

\(\mathrm{CaCO_3+2CH_3COOH\ →\ Ca(CH_3COO)_2+H_2O+CO_2}\)

More Pearly Facts:

 Mollusks actually create pearls as a form of protection from foreign particles, sand and parasites. Natural pearls, though, are very rare in modern times due to a decline in mollusks [ ... ]

Pearls oysters vinegar chemistry chemical reaction acid
Posted in Nature and Wildlife
No Comments | Write Comment
Posted by bio_man   June 30, 2017   2752 views

Ever heard of the game console, Pippin? Neither did we!

The Apple Bandai Pippin, stylized "PiP P!N", was a multimedia technology console, designed by Apple. The console was based on the Apple Pippin platform – a derivative of the Apple Macintosh platform. The system was based on a 66 MHz processor and a 14.4 kb/s modem. It also featured a 4×-speed CD-ROM drive, and a video output that could connect to a standard television display.

Between 1996 and 1997, Bandai manufactured fewer than 100,000 Pippins, but reportedly sold 42,000 systems before discontinuing the line. Due to its failure, much like the Apple Newton, only 18 games were officially released in the US.

Watch a video of its unboxing from 1996, and a preview of a few games.

[ ... ]

Apple games console video video games 1996 90s Apple Newton Ipod
Posted in Technology
No Comments | Write Comment
Posted by duddy   May 30, 2017   3204 views

46 years ago, Alan Shepard pulled out a makeshift six-iron he smuggled on board Apollo 14 and hit two golf balls on the lunar surface, becoming the first - and only - person to play golf anywhere other than Earth.

With little atmosphere and much lower gravity, golf balls on the moon travel much farther than on the earth. Alan attributes his shot of nearly 200 yards to this fact alone.

The other sport played was javelin. [ ... ]

space sports golf astronaut moon
Posted in History
No Comments | Write Comment
Posted by bio_man   April 19, 2017   3791 views

Chances are you've never tasted crude oil, and if you had the chance, you'd probably pass 99.9% of the time. Interestingly, however, crude oil tastes sweet when its sulfur concentration is lower than 0.42% per volume. Sulfur in crude oil is an impurity, and gives off the smell of rotten eggs when found as hydrogen sulfide. Sour crude oil has a sulfur volume higher than 0.50%. The terms "sweet" and "sour" originated from the practice of nineteenth century prospectors who would literally taste or smell the crude to determine its quality. [ ... ]

crude oil taste hydrogen sulfur
Posted in Nature and Wildlife
No Comments | Write Comment
Posted by bio_man   April 15, 2017   3733 views

Started in Imperial China in the 10th or 11th century, upper-class court dancers would wrap their feet to make them permanently smaller.

Although this made it difficult for a woman to walk, small feet indicated that a woman’s husband did not need his wife’s labor. To make the feet even smaller, sometimes the baby’s feet were broken and wrapped tightly. Some baby’s toes were cut off! Footbinding was banned by the Chinese government in 1911, but continued to be practiced in some places for several decades, as shown in the picture above. [ ... ]

chinese practice ancient symbolism asia
Posted in People
No Comments | Write Comment
1 2 3 ... 19 »
RSS Feed   RSS Articles Feed   RSS Comments Feed
More Syndication Links