Perpetual Motion and Free Energy!

NASA's Helical Engine and Other Reactionless Drives

Singular Lagrangians, Constrained Hamiltonian Systems and Gauge Invariance

Chain Fountain/Mould Effect (Just Do the Damn Calculation!)

Physics of the Blackbird Wind Powered Vehicle

Gyroscopic Motion: Equations of Motion for the Two-Top

The Mystery of Gyroscopic Motion: How Does It Do That?

The Dzhanibekov Effect: Equations and Simulations

Does the Falling Pencil Hit the Table? Equations and Answers

Rigid Body Motion and the Dzhanibekov Effect

Differential Forms, Integration and Stokes' Theorem

Multiple Black Hole Zoom-Whirl Orbits

Black Hole Zoom-Whirl Orbit (4,1,3)

Black Hole Zoom-Whirl Orbit (2,0,1)

Black Hole Zoom-Whirl Orbit (3,0,2)

Einstein Hilbert Action (General Relativity)

35. Gravitational Waves VI: More About Sources (General Relativity)

34. Gravitational Waves V: Sources (General Relativity)

33. Gravitational Waves IV: Energy and Momentum (General Relativity)

32. Gravitational Waves III: Linearized Gravity and Gauge Conditions (General Relativity)

31. Gravitational Waves II: Interferometer Detection (General Relativity)

30. Gravitational Waves I: Introduction (General Relativity)

29. Cosmology III: The Big Bang and Inflation (General Relativity)

28. Cosmology II: The Friedmann Equation (General Relativity)

27. Cosmology I: Isotropy and Homogeneity (General Relativity)

26. Rotating Black Holes and Aspherical Collapse (General Relativity)

25. Gravitational Collapse and Black Holes (General Relativity)

24. Black Holes (General Relativity)

23. Schwarzschild Solution and Stellar Models (General Relativity)

22. More Stress, Energy and Momentum (General Relativity)