Quantum physics
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06/11/2026
Across some of its harshest arid landscapes, including Inner Mongolia and the Gobi Desert, China is deploying fleets of autonomous, solar-powered robots to spearhead massive reforestation initiatives.
These specialized machines navigate extreme wilderness conditions to automate the labor-intensive stages of land restoration—drilling precise holes, inserting seedlings, and applying targeted watering.
Guided by a sophisticated combination of GPS navigation, artificial intelligence, and precision robotics, this automated workforce operates continuously under the sun.
By removing human limitations from the equation, the technology dramatically accelerates the speed and accuracy of tree planting in environments where manual labor is slow, exhausting, and logistically difficult.
Is it possible to transform matter by changing it into antimatter.
What is quantum of energy?
An interesting way to use physical laws to make a difference.
This lecture explores the motivation behind the GW approximation, a powerful method used in many-body perturbation theory to improve the accuracy of electronic structure calculations. The discussion covers the limitations of standard approaches like Density Functional Theory (DFT), the concept of quasiparticles, and how the GW approximation corrects energy band gaps and excitation properties.
Key topics include:
Why DFT often underestimates band gaps
The physical meaning of the self-energy operator
How the GW approximation refines quasiparticle energies
Applications in semiconductors, insulators, and nanomaterials
Ideal for students and researchers in condensed matter physics, materials science, and quantum chemistry seeking a deeper understanding of advanced electronic structure methods.
Tesla experiments
The physical laws in action
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Simple tool from an empty bottle.
11/27/2025
The German mathematician Gauss, one of the fathers of non-
Euclidean geometry, was involved in a land survey in Germany and
made many trigonometric measurements between 1818 and 1832. These included measuring the angles of a large triangle with vertices at the tops of three prominent hills near Gottingen in northern Germany. Within the accuracy of the measurements, the angles added up to the Euclidean value of 1800, giving no evidence of any curvature on the length scales that were accessible to him.
A modern measurement was made by the Planck satellite in 2015.
This set limits on any spatial curvature of our Universe over cosmological distances: if it is non-zero, it must involve length scales at least of order 1028m and possibly greater { some 100 times greater than the size of the observable Universe. The Planck results are compatible with zero spatial curvature.
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