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Hi. Trying to find a vendor in USA and can only find a picture. Perhaps I need the correct terminology. Edited - added : It is used to expand hose ends and other whatevers.

Thanks. So at least two causes. Bacteria and ultraviolet. Rubber turned to gooey I have seen only indoors. Cracked rubber only outdoors. Hmmm.

Thanks. So UV is not destructive to bacteria ?

Thank you StringJunky. Edited : added ----> If bacteria are guilty; is it safe to say that rubber exposure to ultraviolet light would prevent vulcanized rubber degradation ? (It does not happen to tires as far as I know; but indoors kept rubber is prone to) The latex bands of my scuba spearguns are suggested to be kept away from sunlight. Could that be a goofy empirism ? Unless there is more reasons for rubber degradation...

No, and thank you. I did, 44 years ago.

Read that when rubber turns to a gooey, is because ozone acted on it... or was improperly vulcanized, or... solvents/chemicals nearby are guilty... Can a piece of that 'degraded' rubber 'infect ' healthy rubber kept nearby and deteriorate it ?

I thank you Bender very much for replying,

What to expect ? Without a driver being of mandatory presence in the vehicle, and if so, cheat placing a concrete block on the seat and send it its way ? Punch a button to bypass a valet assisted parking ? Send the car by itself to pick up kids from school ? Exit the car at the office building and send it to find a parking place ? Call the car on a smart phone to pick you up at the workplace main door ? Arrive to work place and send the car back home for the wife to go somewhere ? Send the car to the hardware store with a purchase list and get the goodies by your garage door ? Send the car to the mechanic for oil change/whatever and back when done ? Go ahead, continue...

Thanks, Janus. Then, there is where am stuck. To express the event into an integral equation. Potential energy of the compressed spring Ep = 1/2 x F x d = 356N x 0.5m / 2 = 89 J. Which with 'no losses', transfers to the rod as kinetic energy Ek: Ep = Ek Ek = 89 J = 1/2 x m x v^2 v^2 = 89 J x 2 / 1Kg v = 13.34 m/s Got it or goofed ?

Please check my rationale... Initial velocity Vi is 0, spring compressed. Impulse force F applied is 356 Newtons at start of travel. Time the force is applied is 0.1 seconds during spring expansion = Δt Final velocity Vf at release is unknown = Vf = Vfinal - Vinitial = Δv Acceleration is a = Δv/Δt = F/m Δv = Δt F /m = 0.1s x 356N / 1Kg = 35.6 m/s <---- take-off velocity. a = 35.6m/s / 0.1s = 356m/s^2 The kinetic energy Ek = mv^2 / 2 1 x 35.6 x 35.6 /2 = 633.68 Joules. But, do I instead need to integrate the force applied during 0.1 second while linearly decreases to zero ?

Lightning heats air. Heated air expands. Expansion of air produces a sonic wavefront.

|\/\/\/\/\/\/\/\/\/\/\|======================== ---> Took 356 Newtons to compress a spring 0.5 metre. A 1 Kg rod contacting its end gets pushed when the spring is released. Is that enough data to calculate the acceleration, or : Took 356 Newtons to compress a spring. A 1 Kg rod contacting its end gets pushed during 0.1 second when the spring is released to full extension. Is that enough data to calculate the acceleration ? What formula should be applied ? -Ignoring friction, drag- Is the calculated acceleration result the one at the end of spring extension; at position 0.5m away and 0.1 second from firing ? ( The initial force applied to the rod is 356 Newtons and linearly? decreases to zero in 0.5m of travel that takes 0.1 second. ) Nope, not homework

Instead of April first, PBS television showed today as news, the invention of a domestic hydrogen generator by a Greek inventor, based on resonance to split water... Very well made prank with all the flavor of being breaking news, with the presence of scientists evaluating the contraption at the inventorś home, and surrounding details of the story. Except in the U.S., the pranks day is December 28. [ http://www.pbs.org/newshour/episode/pbs-newshour-full-episode-dec-26-2016/ ]

Thank you, StringJunky. Interesting. Those are the chemicals listed for snow melting, which drain to rivers.

Hi. What effects can calcium chloride, magnesium chloride, potassium chloride, sodium chloride, potassium acetate; cause to aquatic life in rivers and lakes ?

Isn't the mash what is distilled ?

Thanks. Found a yeasts temperature chart but for beer, and are 'low' temperature; will look for whiskys. ----> https://byo.com/resources/yeast Many 30K gallon tanks I saw ----> https://www.whisky.com/fileadmin/_processed_/csm_fermenter_a644353ce0_66e53aac0234e0936fadba56951c07c1_1eeaef6067.jpg

Took a tour at a nearby distillery and they were fermenting the mash on huge tanks with no lid and at 66 degrees Farenheit. It seemed unusual to me, without much knowledge of producing ethanol. Does 'no lid' and '66 F' seem normal to you ? Or it all depends on the yeast type, and is there a yeast that 'works' at that temperature ?

180 degrees patterned sprinklers on each side of the driveway, directed onto it. Enough of them to melt your snowfall... or make a real icy mess if it is waaay too cold... You can improve it with an electric valve remotely controlled for comfort. Sprinklers should be very discounted this season of the year. I will buy all the snow you can deliver... in August.

Hi. I believe I do understand the 'normal' magnetostriction, when transformer core materials shrink/expand mechanically with their exposure to magnetic fields, but have difficulty in how minute compressions/expansions may generate enough electricity to consider it viable as power generation. ----> http://earthtechling.com/2013/05/doing-wave-energy-with-no-moving-parts/ ----> http://www.greenpatentblog.com/2015/12/01/oscillas-power-bars-generate-energy-from-waves/ Light, please ?

The nearest corner of the house has the suspect downspout; there is another at the corner in front of the vehicle, inspected its pipe inside and that one on front of the vehicle bends/aims towards the one by the back of the vehicle; The broom shows in the hole. The snake did not do it. I just disconnected both downspout bottoms to let it flow onto the paved driveway/soil surface to evaluate the hole after rain...

Thanks, arc. 1. 8 metres from the paved street. 2. Curbs, yes. Being not flat terrain, there is no storm drains nearby until a couple of blocks downslope as rain does not puddle at all. 3. Neighborhood is from the seventies, house was built in 1996 (20 years new) Sinkhole terrain is 0.7m above the street level. Water at the street does not enter the yard. Its the reverse. Not a soft enough soil to probe. County topographical maps show no sink holes in the area. In three days I will have utilities demarked and a friend will come with digging equipment to explore. Will try to add a picture later.

Thanks, gentlemen. Not a common ocurrence in the area. Ground is concrete paved at the area that excavation would be convenient to inspect.

Hi. Bought a property. It has a 1m diameter, 1m deep sinkhole by the front yard, 5m from the house. The concrete block foundation shows zero signs from being affected, not even a hairline crack anywhere. Neighbors from the area say it has always been like that. That when filled by previous owners, very slowly soil caves in. Do not know what 'very slowly' means. Guessing, takes a year or two to need refilling with dirt. There is a confirmed no relation with a mains water leak. Sewer lines are distant and PVC. No foul smells emanate. Terrain is very high in relation with the rest of the neighborhood. Could be said there is very little higher terrain around, but there is some. Bottom of pit shows smoothed gravelish look, like water flowed. There is never water every time I checked. Previous owners are not available. Municipality has no maps, clues, reports, build permits blueprints nor help. There is a chance a roof downspout into ground PVC piping with no discernible underground path has something to do with it, by my suspicion. The downspout enters the soil 7 metres away into a pipe. There is no signs of any pipe in the pit. There is no signs of that pipe exiting/surfacing anywhere. What would you suggest to do ? What would be a method to trace at the surface the path of the downspout drain ? What would happen if someone pours Portland cement in the sink hole ? Thanks. Edited - added: Just thought of... ¿would it make sense to pour water in the downspout pipe entering the soil and monitor the bottom of the pit ? Have not inspected such while raining... Or, any clever action on your mind ?