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IR data transmission is also employed in short-range communication among computer peripherals and personal digital assistants. These devices usually conform to standards published by IrDA, the Infrared Data Association. Remote controls and IrDA devices use infrared light-emitting diodes (LEDs) to emit infrared radiation that is focused by a plastic lens into a narrow beam. The beam is modulated, i.e. switched on and off, to encode the data. The receiver uses a silicon photodiode to convert the infrared radiation to an electric current. It responds only to the rapidly pulsing signal created by the transmitter, and filters out slowly changing infrared radiation from ambient light. Infrared communications are useful for indoor use in areas of high population density. IR does not penetrate walls and so does not interfere with other devices in adjoining rooms. Infrared is the most common way for remote controls to command appliances. Infrared remote control protocols like RC-5, SIRC, are used to communicate with infrared.
What is the IrDA?
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The answer: the Infrared Data Association

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Countries in the top quartile of HDI ("very high human development" group) with a missing IHDI: New Zealand, Chile, Japan, Hong Kong, Singapore, Taiwan, Liechtenstein, Brunei, Andorra, Qatar, Barbados, United Arab Emirates, and Seychelles.
Which Caribbean nation is in the top quartile of HDI (but missing IHDI)?
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The answer: Barbados

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As the Ottoman Empire gradually shrank in size, some 79 million Turkish-Muslims from its former territories in the Caucasus, Crimea, Balkans, and the Mediterranean islands migrated to Anatolia and Eastern Thrace. After the Empire lost the Balkan Wars (191213), it lost all its Balkan territories except East Thrace (European Turkey). This resulted in around 400,000 Muslims fleeing with the retreating Ottoman armies (with many dying from cholera brought by the soldiers), and with some 400,000 non-Muslims fleeing territory still under Ottoman rule. Justin McCarthy estimates that during the period 1821 to 1922 several million Muslims died in the Balkans, with the expulsion of a similar number.
When did the Balkan Wars take place?
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The answer: 191213

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Western commentators post-9/11 often perceive madaris as places of radical revivalism with a connotation of anti-Americanism and radical extremism, frequently associated in the Western press with Wahhabi attitudes toward non-Muslims. In Arabic the word madrasa simply means "school" and does not imply a political or religious affiliation, radical or otherwise. Madaris have varied curricula, and are not all religious. Some madaris in India, for example, have a secularised identity. Although early madaris were founded primarily to gain "knowledge of God" they also taught subjects such as mathematics and poetry. For example, in the Ottoman Empire, "Madrasahs had seven categories of sciences that were taught, such as: styles of writing, oral sciences like the Arabic language, grammar, rhetoric, and history and intellectual sciences, such as logic." This is similar to the Western world, in which universities began as institutions of the Catholic church.
How many science disciplines were taught at madaris in the Ottoman Empire?
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The answer:
seven