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pavelow

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  1. pavelow
    Light is subject to a quantum theory called wave-particle duality. This theory proposes that matter exhibits both properties of a particle and properties of a wave.

    The experiment that shows light's wave-like properties is the double slit experiment. when light was shone through two slits close together, and a screen was placed behind the slits, the impact pattern didn't look the way one would expect a particle impact pattern to look like. After going though the slits, the light diffracted, creating a wave diffraction pattern on the screen, showing light's wave-like properties.

    Light's particle properties are shown in another experiment. Light is passed through "absorber" planes, which don't affect waves. however, when the light passed through the absorbers, the wave after going through the absorber was considerably weaker. This confirmed that light has some particle like properties.

    Light is neither particle nor wave and yet exhibits properties of both, which can be experimentally observed.
  2. pavelow
    "The ocean covers 71 percent of the Earth's surface and contains 97 percent of the planet's water, yet more than 95 percent of the underwater world remains unexplored."

    Source: http://www.noaa.gov/ocean.html

    Many obstacles exist keeping widespread ocean exploration from becoming something not extremely difficult.

    One obstacle is the pressure under water.

    "The deeper you go under the sea, the greater the pressure of the water pushing down on you. For every 33 feet (10.06 meters) you go down, the pressure increases by 14.5 psi (1 bar)."

    Source: http://oceanservice.noaa.gov/facts/pressure.html

    To efficiently explore the ocean depths, the tremendous water pressure must be dealt with in order to keep electrical instruments working. Additionally, the electrical instruments would also have to be waterproofed.

    The deeper into the ocean you travel, the darker it becomes. A vast majority of the ocean is pitch black and receives no sunlight. In the early 1500s, scientists were already looking into space, but no one could look much farther than a few dozen feet deep into the ocean. Because a large amount of the equipment needed to explore the oceans have been invented fairly recently, deep sea exploration hasn't been established like other fields of science.

    The harsh foreign environment of the deep sea and engineering challenges that come with it have made it difficult to explore the worlds oceans.
  3. pavelow
    This blog was inspired by this fact:

    The New York City water supply system leaks at a rate of up to 36 million US gallons (140,000 m^3) per day.
    Source: http://www.nytimes.com/2008/11/23/nyregion/23tunnel.html?pagewanted=2&_r=0

    Our water is extensively purified, and is completely safe to drink, but how can it be safe if some of the biggest supply pipes have holes all over?

    Besides the full -on sanitation of the water, one part of the solution is that our water supply contains some residual chlorine and other chemicals that stop bacteria growth from occurring in tap water. Any pipe leaks/breaks that occur in supply lines that can actually affect water quality can be isolated and the water diverted until a replacement segment is installed. also, the pipes are pressurized to a level where nothing could get into the system through a hole because of the pressure difference. This is visualized by seeing water leak OUT of a pipe, and not seeing things go in.

    By the way, tap water is safer than bottled water and is subject to stricter regulations in many different tests.

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