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2. Theory of relativity - Wikipedia

   en.wikipedia.org/wiki/Theory_of_relativity

   Technically, general relativity is a theory of gravitation whose defining feature is its use of the Einstein field equations. The solutions of the field equations are metric tensors which define the topology of the spacetime and how objects move inertially.

3. Tardigrade - Wikipedia

   en.wikipedia.org/wiki/Tardigrade

   The tardigrade nervous system consists primarily of the brain and four segmental ganglia associated with the four body segments. The brain comprises about 1% of the total body volume. The brain develops in a bilaterally symmetric pattern. Tardigrades have a dorsal brain atop a paired ventral nervous system.

4. Reclaimed water - Wikipedia

   en.wikipedia.org/wiki/Reclaimed_water

   Reclaimed water. Water reclamation is the process of converting municipal wastewater or sewage and industrial wastewater into water that can be reused for a variety of purposes . It is also called wastewater reuse, water reuse or water recycling. There are many types of reuse.

5. Three-body problem - Wikipedia

   en.wikipedia.org/wiki/Three-body_problem

   The three-body problem is a special case of the n-body problem. Historically, the first specific three-body problem to receive extended study was the one involving the Moon, Earth, and the Sun. In an extended modern sense, a three-body problem is any problem in classical mechanics or quantum mechanics that models the motion of three particles.

6. Newton's laws of motion - Wikipedia

   en.wikipedia.org/wiki/Newton's_laws_of_motion

   Newton's first law expresses the principle of inertia: the natural behavior of a body is to move in a straight line at constant speed. A body's motion preserves the status quo, but external forces can perturb this. The modern understanding of Newton's first law is that no inertial observer is privileged over any other.

7. Surface tension - Wikipedia

   en.wikipedia.org/wiki/Surface_tension

   Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects (e.g. water striders) to float on a water surface without becoming even partly submerged. At liquid–air interfaces, surface ...