A needle has a higher density than water. Normally, it falls directly to the bottom of the water. But when the needle is put into the water horizontally with caution it can float due to surface tension. The water keeps its round shape because there are no water molecules outside the surface to balance this inward pull. Putting the needle horizontally to the surface of the water has a larger contact area and less pressure is exerted on the water surface. (Breanna)
