Tag Archives: mobile

The First Mobile Phone?

Posted on July 24, 2012 by Andrew

In 1879, Professor David Hughes noticed that a clicking noise occurred in his home-made telephone whenever he used his induction balance. Hughes eventually found that the induction balance had a loose contact, and that the clicking went away when the contact … Continue reading →

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Are Radio Waves Bad for Your Health?

Posted on February 4, 2012 by Andrew

The health risks associated with radioactivity have been recognized for many years. Alpha, beta and gamma emissions from radioactive sources can ionize atoms or molecules that they encounter by detaching electrons from them. People exposed to high levels of ionizing … Continue reading →

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