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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. 
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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Updated: Jun 27, 2025

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What Is Light in Dark Times?

Sue E Estroff

    Perspectives in Biology and Medicine
    |April 25, 2024
    PubMed
    Summary

    This graphic essay explores the human condition and honesty through visual storytelling. It offers a unique, artful approach to complex questions, making it valuable for contemporary learning.

    Area of Science:

    • Anthropology
    • Visual Culture Studies

    Background:

    • The book "Light in Dark Times" evolved from a presidential address to a coauthored graphic essay.
    • It delves into profound questions about humanity, time, and honesty, using light and dark imagery.

    Purpose of the Study:

    • To critically assess the content and form of the "Light in Dark Times" graphic essay.
    • To examine its relevance in understanding contemporary societal challenges.

    Main Methods:

    • Critical analysis of a book-length graphic essay.
    • Exploration of its visual and narrative elements.

    Main Results:

    • The graphic essay offers an expansive representation of ideas and scholars.
    • Its format is both intellectually stimulating and visually engaging.

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    Conclusions:

    • "Light in Dark Times" serves as a significant introduction to visualized learning.
    • It provides a framework for apprehending complex contemporary issues.