Episode 82: Racial Differences in Intelligence

• March 12th, 2017

A discussion of the evidence and methodological issues pertaining to explaining the causes of racial differences in intelligence, with a focus on evaluating the hereditarian hypothesis that such differences are largely genetic. Recommended pre-listening is Episode 81: Intelligence Part 2.

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Episode 81: Intelligence Part 2

• February 25th, 2017

Continuing the series on intelligence, in this episode I discuss the genetic and neurological correlated of intelligences, the efficacy of measures to increase intelligence, and the causes and consequences of the Flynn effect. Also includes an analysis of the heritability of intelligence and how to properly interpret heritabilty research. Recommended pre-listening is Episode 80: Intelligence Part 1.

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Episode 80: Intelligence Part 1

• February 13th, 2017

The first in a three part series on human intelligence, covering debates about the definition of intelligence, how intelligence is measured, factor analysis and the origin of the g factor, and interpretations of the g factor as corresponding to intelligence. Also includes an analysis of Gardner's theory of multiple intelligences, and the cross-cultural validity of intelligence tests. Recommended pre-listening is Episode 79: Basic Concepts in Statistics.

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Episode 79: Basic Concepts in Statistics

• January 23rd, 2017

A concise introduction to key concepts of statistics, explained in as clear a manner as possible. Includes a discussion of key concepts of probability, types of statistical data, sampling methods, the difference between descriptive and inferential statistics, statistical significance, and p-values. I conclude with a brief look at three common statistical tests; the chi-square test, t-test, and linear regression.

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Episode 78: Hearing

• September 18th, 2016

An explanation of the process of human hearing, covering the structure and function of the outer, middle, and inner ears, with a focus on explaining how the hair cells of the cochlea transduce mechanical motion into electrical signals that are interpreted as sound. I also discuss the mechanisms of sound localisation, some of the causes of deafness, and briefly outline the workings of the cochlea implant. Recommended pre-listening is Episode 53: Sound and Music.

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Episode 77: Nuclear Physics and Radioactivity

• July 31st, 2016

An introduction to the physics of protons and neutrons in the atomic nucleus, with a focus on explaining the different modes of radioactivity, alpha, beta, and gamma decay, as well as different ways of measuring radiation and some of its biological effects. I also discuss some applications of radioactivity in radiometric dating, radiotherapy, nuclear power, and nuclear weapons. I conclude by discussing a few popular misconceptions about radioactivity. Recommending prelistening is Episode 8: History of the Atom.

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Episode 76: GDP and Unemployment

• June 3rd, 2016

An introduction to the economic concepts of GDP (Gross Domestic Product) and unemployment, including a discussion of how these concepts are defined, how they are measured, their relevance to understanding economic activity, and some limitations of these concepts as they are currently employed. Recommended pre-listening is Episode 65: Inflation and Interest Rates.

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Episode 75: Cellular Respiration

• May 7th, 2016

An overview of the processes involved in the generation of energy in cells, including a discussion of the role of ATP in energy storage, glycolysis, the krebs cycle, oxidative phosphorylation, and ATP synthase. Recommended pre-listening is Episode 18: Biochemistry Basics.

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Episode 74: Minerals and Rocks

• December 31st, 2015

A discussion of minerals, including their main properties such as crystal structure, habit, cleavage, lustre, and hardness, followed by a brief overview of some of the major mineral classes, with a focus on the various types of silicate minerals. I also discuss the rock cycle and the relationship between the three major types of rocks: igneous, sedimentary, and metamorphic. 

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Episode 73: Introduction to the Immune System Part 2

• June 30th, 2015

Continuing on from the previous episode, I discuss the role of antibodies and antigens in mediating adaptive immunity, and follow with a discussion of the functions and roles of B-cells and T-cells. I conclude the episode with an overview of the many components of the immune system and a discussion of how they interact to protect the body from pathogens. Recommended prelistening is Episode 72: Introduction to the Immune System Part I.

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