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2. Head-related transfer function - Wikipedia

   en.wikipedia.org/wiki/Head-related_transfer_function

   HRTF filtering effect. A head-related transfer function (HRTF) is a response that characterizes how an ear receives a sound from a point in space. As sound strikes the listener, the size and shape of the head, ears, ear canal, density of the head, size and shape of nasal and oral cavities, all transform the sound and affect how it is perceived, boosting some frequencies and attenuating others.

3. Head voice - Wikipedia

   en.wikipedia.org/wiki/Head_voice

   Head voice. Head voice is a term used within vocal music. The use of this term varies widely within vocal pedagogical circles and there is currently no one consistent opinion among vocal music professionals in regard to this term. Head voice can be used in relation to the following: A particular part of the vocal range or type of vocal register.

4. Common ethanol fuel mixtures - Wikipedia

   en.wikipedia.org/wiki/Common_ethanol_fuel_mixtures

   Ethanol fuel mixtures have "E" numbers which describe the percentage of ethanol fuel in the mixture by volume, for example, E85 is 85% anhydrous ethanol and 15% gasoline. Low-ethanol blends are typically from E5 to E25, although internationally the most common use of the term refers to the E10 blend. Blends of E10 or less are used in more than ...

5. All the 'Inside Out' 2 emotions and the actors who voice them

   www.aol.com/news/inside-2-emotions-actors-voice...

   Tony Hale as Fear. Fear voiced by Tony Hale. (Disney / Getty Images) Hale replaces Bill Hader as Fear, the emotion who ventures to protect Riley from potential disasters, in "Inside Out 2." The ...

6. The Science Behind Why Coke Tastes Better At McDonald's - AOL

   www.aol.com/science-behind-why-coke-tastes...

   The Temperature. We all know that soda tastes better when it’s ice cold. McDonald’s makes sure that your Coke is chilled at every stage, even before it reaches the soda fountain. The stainless ...

7. Ultrafilter - Wikipedia

   en.wikipedia.org/wiki/Ultrafilter

   Ultrafilters on partial orders. In order theory, an ultrafilter is a subset of a partially ordered set that is maximal among all proper filters. This implies that any filter that properly contains an ultrafilter has to be equal to the whole poset. Formally, if is a set, partially ordered by then. a subset is called a filter on if.