You have been given the superpower to change one law of nature, how do you use it.
If I had the power to change something within the laws of nature, I would first try to define the laws of nature. The laws of nature will forever be continuously defined by philosophers and scientist.
Since many laws of nature are a regularly occurring and inevitable phenomenon that is observable within humanity. I will never change any law of nature. Changing any law of nature will certainly screw up humanity.
If I had a superpower, I want humanity to establish a deeper understanding of how the whole is greater than the assembled parts. Hence the symbol of “Yin & Yang.”
Expedition Nomadic Adventures 
Thank you so much for your comment. :-)