Torch

A torch is a portable light source with a much smaller radius than a campfire. It is made with 3 grass and 1 twig. It's durability is used while it is in hand, regardless of what time of day it is. It will provide light for a minute.

When put into a science engine, they give up to 10 research points depending on their remaining durability.

Clicking and dragging a torch over a tree will give you the option to light the tree on fire.

Infinite torch method
An easy way to keep your torch 10x longer is by repeatedly clicking the torch, which basicly just keeps unequipping and equipping the torch. This method however doesn't work when trying to do any other actions, and mostly just serves for travelling during night, or just going through the night.