I noticed from updating my iPad to the lastest version that the extended keyboard buttons have become slightly smaller

Im not too familiar with threading but I thought I shoud use it for a physics test program I made with scene

Is it a good idead to start a new thread like this every time or should I do this a different way?

(This basically checks to see if the circles collide with each other and changes color if it happens; and this is only a portion of the program)

def update(self):
		for circle in self.circles:
			_thread.start_new_thread(self.check_collision, (circle, ))
				
	def check_collision(self, circle):
		for other in self.circles:
			if circle != other:
				dx = circle.position.x - other.position.x
				dy = circle.position.y - other.position.y
				if math.hypot(dx, dy) < (circle.radius + other.radius):
					circle.color = COLLIDE_COLOR
					break
				else:
					circle.color = CIRCLE_COLOR