What would you do if you had the power to manipulate the size of anything?

I would make a diamond larger probably or some other gem stones.

 

Leaving aside the philosophical question of "what is an item?" (if I scratched my table it would remove some atoms, still a table, do it enough and it falls over and is no longer a table even if 80% of what was my table is still there and it also depends where I scratch).

You basically break thermodynamics with this one so that -- can either instantly heat something or instantly cool it, that or you are creating energy or destroying it (so still breaking thermodynamics). You might even be able to have some fun with atomic physics if you make things larger than atoms can hold or small enough that they become their own little black hole (ones with little mass tend to blink out of existence fairly quickly) -- oh no more nuclear waste (not that you need black hole levels for that -- see how explosive compression nuclear bombs work, short version closer together = more activity = shorter half life or indeed potentially more power from the same substance).
Depending upon how atomic physics works in this you also could wind up making perfect shielding for radiation, something your oxygen will never escape from (to say nothing of silly mass of it in reserve and potentially able to be made from other atoms) and with that, possibly plus a black hole drive too, you have space travel sorted.
Computers would be the same in that you could miniaturise things, or fix them.
You could blow things up from atomic size, shape them perfectly and shrink them back down to do incredible things.
Even more basic then depending upon how mass works in this then you also change logistics overnight -- mass and volume tending to be the key drivers.

So yeah it is a crazy broken power.

 

Set the Size of every not surgically removable Tumor/Cancer/Cyst and that kind.

...to set the Size 0.

...or -1 if that helps more.....

 

Well you could use that to end world hunger (until you die)
It’s also helpful for people with a giant/shrink fetish
People with gigantophobia or similar could help themselves out by shrinking stuff down.
It could also be used to make a lot of money. Not sure what I would do though (yes I am ;3)

 

Would the objects retain their mass, or would they get heavier/lighter with the size change?

 

Obligatory 'please my girlfriend better' joke just to get it out of the way, someone has to.

 

Mini Elephant.

 

my idea? find a rare rock, multiply it by 100 and sell it to the someone who has a lot of money. they get a giant rock and i get something i could use.

 

Make myself 3 itches shorter. 5’4 is cute, 5’1 is cuter.

 

I'd decrease the "size" of religion's impact on society to 0. The same goes for the corrupted, abusive movement known as feminism.

 

-Make a miniature mansion, then shrink myself and live in it
-Buy a drone, shrink the controller and myself, fly through the skies
-Do a Kemonito cosplay

 

Great minds think alike

Would go around playing pranks on people by shrinking their clothes or turn their phones into tablets a bit like how in the shazam movie going around charging random passerby's phones

 

(It's the second fatality in the video. And yes, they put something as random as THAT in an MK game! XD)

 

big boobs

lol

 

Oh please Don't ask Me this question. [obvious answer awaits]. LoL

 

I would make the "one horse sized duck or one hundred duck sized horses" question a reality. No longer hypothetical, you now must fight your chosen answer.

 

I would take the horse sized duck.
Cube law means it would probably collapse under its own weight or be unable to effect much in the way of strength and I could defeat it handily, before having what might be the nicest bbq in history (at least since mammoths anyway).
I once had to walk through a pen of small puppies and they almost tripped me up and there was only about 15 of them.

On the other hand if I could beat the horses and become their master then my new herd of miniature fighting horses would make for a pretty sweet pimp walk down the road.

 

I'd shrink myself to the size of a baby, so I could truly live like one.