My Third Post

Stuff learned at work while interacting with Watson (IBM's Artificial Intelligence) scientists :

 1. There has been more data generated in the last 2 years than in the entire history of mankind.
 2. Last year's data would be the equivalent of every human on the planet (approx 7 Bn) getting 175  newspapers...every...day.
 3. There are about 6 Bn personal devices accessing the Internet; next year that number is expected to be 8 Bn.  (And how many people are on the planet?)
 4. With the Internet of Things (IoT) [Fitbits, thermostats, medical monitors] the data volume will continue to  grow.
 5. I broke an app designed to learn from human interaction with my question, "How much guacamole can you fit  in a tuba?"

I'll never know where it gave up. I'm pretty sure it knew the formula for volume of a cylinder [V=π r2 h] but maybe not a cone. Still, it should be found easily on the Internet [Volume of a frustum of a cone: V=πh/3(R2 + Rr + r2)].

Maybe it was knowing the bore of the aperture which varies. Bore sizes of tubas may vary between .580" to .870"

Maybe it was the 'trick' question of not defining the tuba pitch. 

The main tube of a B♭ tuba ≈ 18'... a C tuba is ≈ 16 feet... an E♭ tuba is ≈ 13 feet, and for a F tuba ≈ 12 feet.

A B♭ tuba (18') tuba with a .750" bore, and presuming a 12" midsection, & an 18'" bell:

π * .3752 * (.625 * (18" * 12"))                                   ≈59.64"
(π(.25(18"*12")))/3 * (62 + (6 * .375) + .3752)       ≈ 2170.90"
(π(.125(18"*12")))/3 * (92 + (9 * 6) + 62)                 ≈ 4834.17"
                                                                               ≈7063.81 cu. in. or 30.58 gal.

Of course, we could put a sealed tuba underwater and measure the displacement. Better, yet...just the tuba player.

Signed, 

The resentful fat kid who always got the tuba in music theory class.