Ken's blog

the common belief goes, you never know when you might need to murder, so it is good to own a gun, and so many people do (under the pretense ...

honey famously supposedly has extremely long shelf life.  package or repackage honey into very sturdy containers for long-term storage.  wha...

some string quartet pieces might be best recorded with four separate channels then played through four widely separated speakers, so that th...

are there any room HEPA air filter machines not designed around the razors-and-blades business model? the only thing I am aware of is buil...

create a physical model of a polyhedron with the plane equation for each face printed on each face.  this should be easy. manually applyin...

what would it be like to cook with a microwave oven much more powerful than a normal consumer device? using an electric stove power outlet...

some features desirable in a hypothetical programmable mouse: any (decent) programmable mouse can assign programmable mouse buttons to act...

at x=0, the functions x^x and x^-x are both tangent to the x axis (derivative is infinity).  this is not obvious from small plots .  limitin...

make it easier to examine the markings on a pill to verify that it matches what the label on the prescription bottle describes.  goal is to ...

create a tombstone featuring the letter F, inspired by gaming. for example, the F could take the place of the cross often prominently carv...

4900 square tiles: arrange the tiles in a 70-by-70 square to form a picture, similar to a regular jigsaw puzzle, except pieces don't int...

color 5 sides of a cube white, red, green, blue, black.  arrange many such cubes into a mosaic, turning each cube to have the face with the ...

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89,... I don't understand. (1/2 + 14.1i), (1/2...

Create a device which sounds audible ticks all day long.  Inspired by a ticking clock.  However, unlike a clock, the tick rate varies by tim...

The cool thing you can do with a diamond is scratch rubies and sapphires and tungsten carbide and everything else with it, including other d...

Consider replacing the common electrical setup of two up-down light switches controlling one light in XOR fashion with two push buttons.  Ea...

Continuous feed paper from a roll. Press a button to automatically type current date and time. Of course, when you hit a regular letter ...

Encourage hand-washing by making it easy for people to discover soaps pleasing to use for themselves.  Everyone has different preferences: d...

A door lock with an electrical component will fail to function if it doesn't have electricity, for example, if its battery runs out.  I...

Design a light with an ambient light sensor that automatically turns on the light when it becomes dark and turns it off when it becomes ligh...