The missing mass

Physics World ◽  
2021 ◽  
Vol 34 (10) ◽  
pp. 25v-25v
Author(s):  
Chris Atkins

In response to the Lateral Thoughts quiz “Sporting chance”, in which question 8 asked for a rough estimate of the theoretical maximum height a pole vaulter could jump, and why the actual world record is slightly above this.

Nature ◽  
2016 ◽  
Vol 536 (7615) ◽  
pp. 134-135
Author(s):  
Declan Butler
Keyword(s):  

Author(s):  
Yujin Nagasawa
Keyword(s):  

This chapter considers existing arguments against perfect being theism, classifying them into three types: (i) arguments that purport to show the internal incoherence of God’s individual properties, (ii) arguments that purport to show the mutual inconsistency between God’s properties, and (iii) arguments that purport to show the mutual inconsistency between the set of God’s properties and a certain fact about the actual world. The chapter then develops a radically new and economical defence of perfect being theism, a defence that appeals to the maximal concept of God. This defence, it is argued, undercuts nearly all the arguments of the three types at once.


Author(s):  
Andrew Gelman ◽  
Deborah Nolan

Descriptive statistics is the typical starting point for a statistics course, and it can be tricky to teach because the material is more difficult than it first appears. The activities in this chapter focus more on the topics of data displays and transformations, rather than the mean, median, and standard deviation, which are covered easily in a textbook and on homework assignments. Specific topics include: distributions and handedness scores; extrapolation of time series and world record times for the mile run; linear combinations and economic indexes; scatter plots and exam scores; and logarithmic transformations and metabolic rates.


Author(s):  
Frank S. Levin

Surfing the Quantum World bridges the gap between in-depth textbooks and typical popular science books on quantum ideas and phenomena. Among its significant features is the description of a host of mind-bending phenomena, such as a quantum object being in two places at once or a certain minus sign being the most consequential in the universe. Much of its first part is historical, starting with the ancient Greeks and their concepts of light, and ending with the creation of quantum mechanics. The second part begins by applying quantum mechanics and its probability nature to a pedagogical system, the one-dimensional box, an analog of which is a musical-instrument string. This is followed by a gentle introduction to the fundamental principles of quantum theory, whose core concepts and symbolic representations are the foundation for most of the subsequent chapters. For instance, it is shown how quantum theory explains the properties of the hydrogen atom and, via quantum spin and Pauli’s Exclusion Principle, how it accounts for the structure of the periodic table. White dwarf and neutron stars are seen to be gigantic quantum objects, while the maximum height of mountains is shown to have a quantum basis. Among the many other topics considered are a variety of interference phenomena, those that display the wave properties of particles like electrons and photons, and even of large molecules. The book concludes with a wide-ranging discussion of interpretational and philosophic issues, introduced in Chapters 14 by entanglement and 15 by Schrödinger’s cat.


Author(s):  
Mark Grimshaw-Aagaard

Mark Grimshaw-Aagaard addresses the role of sound in the creation of presence in virtual and actual worlds. He argues that imagination is a central part of the generation and selection of perceptual hypotheses—models of the world in which we can act—that emerge from what Grimshaw-Aagaard calls the “exo-environment” (the sensory input) and the “endo-environment” (the cognitive input). Grimshaw-Aagaard further divides the exo-environment into a primarily auditory and a primarily visual dimension and he deals with the actual world of his own apartment and the virtual world of first-person-shooter computer games in order to exemplify how we perceptually construct an environment that allows for the creation of presence.


1998 ◽  
Vol 116 (2) ◽  
pp. 782-788 ◽  
Author(s):  
Olin J. Eggen
Keyword(s):  
The Sun ◽  

2020 ◽  
Vol 32 ◽  
pp. 101240
Author(s):  
Peter Rehder ◽  
Jannik Stuehmeier ◽  
Lukas Andrius Jelisejevas ◽  
Alexandra Gulacsi ◽  
Wolgang Horninger ◽  
...  

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