An Euler disc comprises a metal disc body having a maximum radius, an upper surface, a lower surface, a circular polished rounded edge joining the upper surface and the lower surface, and a maximum thickness. The upper surface is formed so that the cross-sectional area of the disc body that is above a horizontal bisector line and outside of a vertical quarter line drawn at one half of the maximum radius is less than 75% of the cross-sectional area of the disc body that is below the horizontal bisector line and outside of the vertical quarter line.

An Euler disc comprises a metal disc body having a maximum radius, an upper surface, a lower surface, a circular polished rounded edge joining the upper surface and the lower surface, and a maximum thickness. The upper surface is formed so that the cross-sectional area of the disc body that is above a horizontal bisector line and outside of a vertical quarter line drawn at one half of the maximum radius is less than 75% of the cross-sectional area of the disc body that is below the horizontal bisector line and outside of the vertical quarter line.

Embodiments provide experiment platforms comprising hardware, software, and user-specified data structures for user-conducted orbital experiments-by-proxy that focus on microgravity as a variable. The experiment is repeated in normal gravity as a control, on a similar platform that may or may not have been constructed and/or programmed by the user. Differences in experimental results performed by similar platforms are thus attributed to the influence of gravity on observed phenomena. Experiments are specified by user-defined data structures which govern the operation of control programs typically previously installed on orbital and ground hardware. Experimentation by proxy and parameter specification allows earthbound students to participate in space-based research at various levels of involvement and at sharply reduced cost, encouraging interest in science and technology in education and future work.

A plasma interaction simulator is presented. The simulator magnetically induces multiple distinct flows of plasma within a physical plasma vessel. The plasma flows collide with each other at flow interaction boundaries where discontinuities arising due to differences between the flows give rise to interactions. Sensors can be incorporated into the plasma simulator to observe and collect data about the plasma flow interactions.

A plasma interaction simulator is presented. The simulator magnetically induces multiple distinct flows of plasma within a physical plasma vessel. The plasma flows collide with each other at flow interaction boundaries where discontinuities arising due to differences between the flows give rise to interactions. Sensors can be incorporated into the plasma simulator to observe and collect data about the plasma flow interactions.

A sensor for measuring shear force and a dummy for testing a vehicle using the same are provided herein. A sensor for measuring shear force which is configured to quantitatively accurately measure shear force applied to a human body who sits on a vehicle seat, and a dummy for measuring shear force using the sensor are provided, wherein the sensor for measuring shear force includes an upper block, an intermediate block and a lower block and is configured such that a first strain gauge is mounted upright between the upper block and the intermediate block and a second strain gauge is mounted upright between the intermediate block and the lower block so that the shear force can be accurately measured without being affected by horizontal tensile force.

An interactive advertising display for allowing a user to test the advertised strength of a glass screen protector for a mobile electronic device. The display includes a striker mounted to a backboard. A mounting assembly secures the striker to the backboard such that the striker is operable between a lowered position and a raised position. Pre-positioned to receive a blow from the striker is a glass screen protector for a mobile electronic device. In operation, the user manually lifts the striker from the lowered position to the raised positioned. When released by the user, the striker free falls from the raised position and impacts the glass screen protector. In this manner, the user may test the advertised strength of the glass screen protector using the interactive advertising display.

A head-disk assembly device, mass spin-valve or gravitational rectifier and method of producing gravitomagnetic induction utilizing Nano-features fabricated on the surface of a hard disk is presented. The Nano-features may include Nano-bumps and Nano-pits. The device includes a computer hard disk, a piezoelectric glide head and/or a GMR read head, a typical hard drive's electronics, wherein defects are fabricated on the said disk using a Focused Ion Beam (FIB) by depositing requisite number of nanobumps of specified height, and etching equal number of nanopits of specified depth a few mils or mm apart on a pre-decided radius. By spinning the said nano-features disk produce (1) an associated mechanical force utilizing a piezoelectric glide head and/or (2) an associated magnetic force utilizing a GMR read head for (a) general use in surface characterization work and (b) for producing power by the presence or the absence of matter on a spinning disk.

A head-disk assembly device, mass spin-valve or gravitational rectifier and method of producing gravitomagnetic induction utilizing Nano-features fabricated on the surface of a hard disk is presented. The Nano-features may include Nano-bumps and Nano-pits. The device includes a computer hard disk, a piezoelectric glide head and/or a GMR read head, a typical hard drive's electronics, wherein defects are fabricated on the said disk using a Focused Ion Beam (FIB) by depositing requisite number of nanobumps of specified height, and etching equal number of nanopits of specified depth a few mils or mm apart on a pre-decided radius. By spinning the said nano-features disk produce (1) an associated mechanical force utilizing a piezoelectric glide head and/or (2) an associated magnetic force utilizing a GMR read head for (a) general use in surface characterization work and (b) for producing power by the presence or the absence of matter on a spinning disk.

A plasma interaction simulator is presented. The simulator magnetically induces multiple distinct flows of plasma within a physical plasma vessel. The plasma flows collide with each other at flow interaction boundaries where discontinuities arising due to differences between the flows give rise to interactions. Sensors can be incorporated into the plasma simulator to observe and collect data about the plasma flow interactions.