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  • Jen-Luc Piquant sez: "They like us! They really like us!"

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"Human voices fall about 8 kHz"?
Gotcha, Jennifer. We can make OVERTONES that high, but most of the sound pressure level and information transmission in a human voice occur between 80 and 1100 Hz, not kHz. (Wikipedia citation). The highest note sung in opera is F6, 1397 Hz.
As someone who can't hear much above 2000 Hz without my hearing aids, I can testify that human speech is easily understood in the frequencies below 2 kHz.

And 20 kHz is the upper limit of detection for those with excellent hearing. Primarily kids.


Thanks for the correction! I briefly considered checking that number, but it was late, I was exhausted, and why deprive my eagle-eyed readers of the chance to weigh in? :)

Well around my house it's all about the Litte Brown Bat (Myotis lucifugus) -- another actual name. I'm currently on a quest to get some to house themselves in a bat house in my yard, I'll report my success if I manage it. here's some information:


There is the famous essay by Thomas Nagel "What Is It Like to Be a Bat", which has more to do about conscious perception than bats, and an interesting essay by Scigliano called "Through the Eye of An Octopus".
It is always good to deflect anthropomorphic solipsism, and consider our
other inhabitants on this planet.

"The concept reminds Jen-Luc Piquant of an anime film called Ninja Scroll, in which a female character was poisonous to the touch --"
Hmmm--I thought that was a generic female trait..;)

Jennifer wrote "Well around my house it's all about the Litte Brown Bat (Myotis lucifugus) -- another actual name."

Some years ago a Little Brown Bat took up residence between the screen and glass of a window in our bedroom -- there was a hole in the screen I hadn't noticed but which it found. Once the bat took up residence, of course, I couldn't repair it. In the morning it would be tucked up in there sleeping. In the evening it would wake, stretch, yawn (pointy little teeth!) groom, and wiggle out to go hunting. Watching it was like watching a miniature cat. It stayed for a month or so, and then disappeared. :(

I thought bats were carnivores, not rodents. More like a flying weasel...

"more like a flying weasel"...They aren't rodents!
Hmmm no, more like a Chiroptera Suidae Sus domestica ;)

Or, from "Calvin and Hobbes":

"What am I going to do about this report on bats? You've got to help me, Hobbes! OK, ... um, first let's make a list of what we know. Yeah! That's a good way to start! Great! Number one: what are bats? They're bugs, aren't they? Yeah, put that down. #1 BATS = BUGS Are you sure? They fly, right? They're ugly and hairy, right? C'mon, this is taking all day!"...

" Calvin- "Hi Susie! Did you write your report? Yeah, I spent all last evening on it. Did you? Well, when you know as much as I do, it doesn't take as long. Mine took about 15 minutes. 15 minutes? Let's see. I guess you won't be setting the grade curve THIS time, Susie! Read it and weep. "Bats: the big bug scourge of the skies." Note the professional clear plastic binder.
Susie - "Bats aren't BUGS!"

BTW, There is a "Bat cave" in Toronto's Royal Ontario Museum (ROM) based on Jamaica's St. Clair Cave. Unfortunately, it's only a diorama, so there's no pungent smell of guano.
My question is about vegetarian bats such as Fruit bats and other pollinators. Do they use their Echolocation purely for travel? Surely they wouldn't need sonar to detect flowering plants?
Nevermind, I looked it up...they have a great sense of sight and smell. (So not all bats are carnivorous)

My hearing was tested up to 40 KHz. Ultrasonic anti-theft systems in stores used to drive me nuts. Now, i just don't go to those places. There's a belle curve, and i live just outside it.

Aren't humans just a sort of big omnivorous non-flying bat?
Nearly one-fifth of all mammal species are bats.

Thank you for teaching me something I didn't know - and I work with bats all the time. The 'jamming frequency' is very interesting. I wish more people where like you and took an interest in bats, and appreciated the good they do. Too many people fear and hate these beautiful creatures that share the planet with us.

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    Physics Cocktails

    • Heavy G
      The perfect pick-me-up when gravity gets you down.
      2 oz Tequila
      2 oz Triple sec
      2 oz Rose's sweetened lime juice
      7-Up or Sprite
      Mix tequila, triple sec and lime juice in a shaker and pour into a margarita glass. (Salted rim and ice are optional.) Top off with 7-Up/Sprite and let the weight of the world lift off your shoulders.
    • Listening to the Drums of Feynman
      The perfect nightcap after a long day struggling with QED equations.
      1 oz dark rum
      1/2 oz light rum
      1 oz Tia Maria
      2 oz light cream
      Crushed ice
      1/8 tsp ground nutmeg
      In a shaker half-filled with ice, combine the dark and light rum, Tia Maria, and cream. Shake well. Strain into an old fashioned glass almost filled with crushed ice. Dust with the nutmeg, and serve. Bongos optional.
    • Combustible Edison
      Electrify your friends with amazing pyrotechnics!
      2 oz brandy
      1 oz Campari
      1 oz fresh lemon juice
      Combine Campari and lemon juice in shaker filled with cracked ice. Shake and strain into chilled cocktail glass. Heat brandy in chafing dish, then ignite and pour into glass. Cocktail Go BOOM! Plus, Fire = Pretty!
    • Hiroshima Bomber
      Dr. Strangelove's drink of choice.
      3/4 Triple sec
      1/4 oz Bailey's Irish Cream
      2-3 drops Grenadine
      Fill shot glass 3/4 with Triple Sec. Layer Bailey's on top. Drop Grenadine in center of shot; it should billow up like a mushroom cloud. Remember to "duck and cover."
    • Mad Scientist
      Any mad scientist will tell you that flames make drinking more fun. What good is science if no one gets hurt?
      1 oz Midori melon liqueur
      1-1/2 oz sour mix
      1 splash soda water
      151 proof rum
      Mix melon liqueur, sour mix and soda water with ice in shaker. Shake and strain into martini glass. Top with rum and ignite. Try to take over the world.
    • Laser Beam
      Warning: may result in amplified stimulated emission.
      1 oz Southern Comfort
      1/2 oz Amaretto
      1/2 oz sloe gin
      1/2 oz vodka
      1/2 oz Triple sec
      7 oz orange juice
      Combine all liquor in a full glass of ice. Shake well. Garnish with orange and cherry. Serve to attractive target of choice.
    • Quantum Theory
      Guaranteed to collapse your wave function:
      3/4 oz Rum
      1/2 oz Strega
      1/4 oz Grand Marnier
      2 oz Pineapple juice
      Fill with Sweet and sour
      Pour rum, strega and Grand Marnier into a collins glass. Add pineapple and fill with sweet and sour. Sip until all the day's super-positioned states disappear.
    • The Black Hole
      So called because after one of these, you have already passed the event horizon of inebriation.
      1 oz. Kahlua
      1 oz. vodka
      .5 oz. Cointreau or Triple Sec
      .5 oz. dark rum
      .5 oz. Amaretto
      Pour into an old-fashioned glass over (scant) ice. Stir gently. Watch time slow.