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  2. Create and manage an AOL Mail account - AOL Help

    help.aol.com/articles/aol-mail-account-and-password

    Create a new AOL account. Go to the main AOL page. Click Sign in in the upper right hand corner. Click Create an account at the bottom of the screen.

  3. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    A diagram of the electromagnetic spectrum, showing various properties across the range of frequencies and wavelengths. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band.

  4. ZX Spectrum graphic modes - Wikipedia

    en.wikipedia.org/wiki/ZX_Spectrum_graphic_modes

    The real ZX Spectrum colours are currently unknown [clarification needed], and they are probably less saturated. To compute the real ZX Spectrum colours, a measurement of the phase-amplitude shift of the chroma sub-carrier has to be performed, for each colour, by an oscilloscope on the ZX Spectrum's PAL output. [citation needed]

  5. Theodor Wilhelm Engelmann - Wikipedia

    en.wikipedia.org/wiki/Theodor_Wilhelm_Engelmann

    Theodor Wilhelm Engelmann (14 November 1843 – 20 May 1909) was a German botanist, physiologist, microbiologist, university professor, and musician whose 1882 experiment measured the effects of different colors of light on photosynthetic activity and showed that the conversion of light energy to chemical energy took place in the chloroplast.

  6. X-ray emission spectroscopy - Wikipedia

    en.wikipedia.org/wiki/X-ray_emission_spectroscopy

    X-ray emission spectroscopy (XES) is a form of X-ray spectroscopy in which a core electron is excited by an incident x-ray photon and then this excited state decays by emitting an x-ray photon to fill the core hole. The energy of the emitted photon is the energy difference between the involved electronic levels.

  7. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 Hz to 3,000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves , are widely used in modern technology, particularly in telecommunication .

  8. AOL Mail Help - AOL Help

    help.aol.com/products/new-aol-mail

    You've Got Mail!® Millions of people around the world use AOL Mail, and there are times you'll have questions about using it or want to learn more about its features. That's why AOL Mail Help is here with articles, FAQs, tutorials, our AOL virtual chat assistant and live agent support options to get your questions answered.

  9. COVID-19 pandemic in England - Wikipedia

    en.wikipedia.org/wiki/COVID-19_pandemic_in_England

    The COVID-19 pandemic was first confirmed to have spread to England with two cases among Chinese nationals staying in a hotel in York on 31 January 2020. The two main public bodies responsible for health in England were NHS England and Public Health England (PHE).

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