• Science

    One in Four Mammals May Soon Be Extinct

    By Jaya Jiwatram Posted on 10.7.2008 4 Comments

    As human populations grow, pollution soils the environment and infrastructure develops, our natural habitat suffers. This may sound familiar, but scientists sent a resounding message today when they announced in a comprehensive five-year global wildlife review that these human-based causes and more are threatening one in four of the world's 5,487 known mammal species and have put 188 species in the critically endangered category.

    10.7.2008 at 08:35pm - Comment by XMENTAL

    I feel living in fiction sometimes,just acompanying with myself.Now human may have such idea to live by themselves.

  • Science

    When Is Carbon an Electrical Conductor?

    By Adam Weiner Posted on 9.30.2008 13 Comments

    And the $64,000 question is ... does graphite conduct electricity? It certainly does! The video demonstration displays this quite convincingly. Graphite is an interesting material, an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.

    10.1.2008 at 08:37am - Comment by XMENTAL

    I use my VC9804A+ to test my "中华绘图铅笔 2B" pencil. The resistance is 11.4 Ω.According to vedio,the voltage is 13V. Then the power=U^2/R=13^2/11.4= 14.8w. This power is just like a little lamp in my room!

  • The Environment

    Einstein Fridge Makes a Green Return

    By Jaya Jiwatram Posted on 9.29.2008 8 Comments

    It looks like the father of modern physics had more up his sleeve than the theory of relativity. Long after he changed the landscape of modern physics, Albert Einstein and his former student Leo Szilard patented a refrigerator that had no moving parts and used only pressurized gases for cooling. It got overshadowed 20 years later, in the 1950s, when more efficient, if environmentally-damaging, freon-compressors for refrigerators became available.

    9.29.2008 at 08:03pm - Comment by XMENTAL

    Use it to freezen Einstein's brain.Then it is really my mind protect my mind.

  • DIY

    Trap Lightning in a Block

    By Posted on 2.19.2008 16 Comments

    There are many unusual things to see around Newton Falls, Ohio—the Wal-Mart with hitching posts for Amish buggies, the Army base with helicopters and tanks proudly arranged on hills—but I was here for the most unusual thing of all: the local Dynamitron. I was here to make frozen lightning.

    2.18.2008 at 11:37am - Comment by XMENTAL

    Cool and beautiful! How long could the bock trap the lighting ?



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