• Volume 25, Issue 8

August 2020,   pages  1063-1171

• Editorial

• Science Smiles

• Dorothy Leavitt Cheney (1950–2018): Understanding the Lives and Minds of Primates

• Dorothy Leavitt Cheney: Life and Work

Dorothy L. Cheney studied the social behaviour, communica-tion, and cognition of monkeys. Her goal was to uncover the selective forces that have shaped the evolution of the human mind.

• The Nature of Time

This article is about the unidirectionality of time. We ex-perience it in daily life and are conscious of the fact that time past is time irreversibly lost. Why is it that we can go back and forth in space but not in time? This time asym-metry can be related to basic physics by a rather ingenious approach. This was initiated by two scientists John Wheeler and Richard Feynman. In 1945, they explored how classical electrodynamics can be described as an action at a distance theory instead of ﬁeld theory. This makes the formulation necessarily time-symmetric. Later in 1962–63 Jack Hogarth and later Fred Hoyle and this author showed that this ap-proach makes it possible to explain the alignment of three arrows of time: thermodynamic, electrodynamic, and cos-mological. Later work by Hoyle and I extended the idea to full-scale quantum electrodynamics.

• The Knight's Tour Problem and Rudrata's Verse

If a chess-knight is moved on a vacant chess-board [8 × 8 square] such that it visits each one of the 64 squares once and once only, the knight is said to execute a Knight’s Tour. Solution to the knight’s tour problem was known in India as early as the 9th century AD as a demonstration of wizardry in composing 32-syllable verses in Sanskrit. A pair of meaningful verses is composed in such a manner that when one verse is written serially (left to right and top to bottom) one syllable a square to ﬁll up 8 × 4 cells — half of a chess board – the other verse appears as the Knight’s Tour. The earliest example of this skill in poetry-composition is given in a Sanskrit treatise on poetics, kāvyālaṅkāra written by Rudraṭa who lived around the ninth century A.D. Knight’s Tour as a mathematical problem was ﬁrst noticed and discussed in the West by Leonard Euler in the eighteenth century. After providing the back ground to the subject as a puzzle on the chess-board, a problem in mathemat-ics and as a challenge in verse-composition, the article discusses the special characteristic of Rudrata’s example where the pair of verses reduces to a single verse.

• Anderson and Line Shape Analysis

We present here an overview of Late P. W. Anderson’s doc-toral thesis on Spectral Line shapes in the backdrop of his very intimate relation with the physics community of Japan—in particular, R. Kubo.

• Teaching and Learning Genetics with $Drosophila$ 5. Lessons from the Experiments with Curly and Bristle Mutant Stocks

Even today, $Drosophila$ remains as one of the potent eukary-otic systems to study diﬀerent dimensions of inheritance. It provides a wide spectrum of genetic resource of mutants which are of immense help to look into the eﬀects of diﬀerent types of mutations as well the mechanisms underlying their mainte-nance. Experiments involving lethal mutations in $Drosophila$ have helped us to realize a few more genetic lessons, and the same is discussed in this communication.

• Teaching and Learning Genetics Graphical Representation Standards for Organic Chemistry Script: IUPAC Recommendation 2008

In this article, we will acquaint ourselves with IUPAC repre-sentation standards in organic chemistry. Most of the chem-istry is expressed through graphical representations, and there-fore, molecular structures shall be sketched carefully so that the drawing conveys exact and desired meaning. There are speciﬁc rules and regulations governing the graphical repre-sentations in chemistry. Less literature is available for this purpose, but the importance of the topic can be well under-stood after knowing that the division of chemical nomencla-ture and structure representation of IUPAC has published the Graphical Representation Standards for Chemical Structures in 2008 comprising 134 pages. The present article focuses on the etiquettes of structure drawings along with a summary in brief about the IUPAC 2008 recommendations in perspectives of organic chemistry.

• Smooth Jordan Curves Inscribe Every Rectangular Shape

• A Charmed Tetraquark at LHC

• The Enigmatic Origins of Li in Sun-like Stars

• Oriental Magpie Robin (Copsychus saularis)

• # Resonance – Journal of Science Education

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