Search Engine Optimization Overview
89
100
Explain that Stuff
A collection of FREE, easy-to-understand science, technology, and how-it-works articles for the whole family!
Seo
Title
The title tag is perfect.
Explain that Stuff
Meta description
The meta description tag is good.
A collection of FREE, easy-to-understand science, technology, and how-it-works articles for the whole family!
Headings
The headings are properly set.
  1. The FREE online science and technology book
  1. Hard stuff... made simple!
  2. How to use this site
  3. What's hot in November 2022?
  4. What's new for '22?
  5. Most popular
  6. What else is on our site?
  7. Who uses this site?
  8. Follow us on your favorite sites!
  9. Save or share this page
  10. Privacy and cookies
  11. More to explore on our website...
  1. Climate change
  2. Heat pumps
  3. Molecules
  4. Carbon offsets
  5. Mirrors
  6. Artificial intelligence
  7. Gravity
  8. History of flight
  9. Cranes
  10. History of electricity
  11. Software
  12. Great psychology experiments
  13. What is science—and why does it matter?
  14. History of communication
  15. Water pollution
  16. Electricity
  17. Nanotechnology
  18. Magnetism
  19. Gears
  20. Batteries
  21. Electric motors
  22. Global warming
  23. Cloud computing
  24. Communications
  25. Computers
  26. Electricity and electronics
  27. Energy
  28. Engineering
  29. Environment
  30. Gadgets
  31. Home life
  32. Materials
  33. Science
  34. Tools, instruments, and measurement
  35. Transportation
Content keywords
The content has relevant keywords.
explainthatstuff
Image keywords
All images have alt attributes set.
SEO friendly URL
The URL is SEO friendly.
https://www.explainthatstuff.com/
404 page
The website has 404 error pages.
https://www.explainthatstuff.com/404-0e292467fa9d798efb247ed9969d29e9
Robots.txt
The webpage can be accessed by search engines.
Noindex
The webpage does not have a noindex tag set.
In-page links
The number of links on the webpage is okay.
Language
The webpage does not have a language declared.
Favicon
The webpage has a favicon.
https://cdn4.explainthatstuff.com/ets-favicon-96x96.png
Performance
Text compression
The HTML file is compressed.
Load time
The webpage loaded in 0.27 seconds.
Page size
The size of the HTML webpage is 13,897.00.
HTTP requests
There are fewer than 18 HTTP requests on the webpage.
  1. https://cdn4.explainthatstuff.com/dot.gif
  2. https://cdn4.explainthatstuff.com/dot.gif
  3. https://cdn4.explainthatstuff.com/ccd-chip4.jpg
  4. https://cdn4.explainthatstuff.com/breathless-chris-woodford-198x300.png
  5. https://cdn4.explainthatstuff.com/dot.gif
  6. https://cdn4.explainthatstuff.com/dot.gif
  7. https://cdn4.explainthatstuff.com/dot.gif
  8. https://cdn4.explainthatstuff.com/optical-mouse-light-guide.jpg
  9. https://cdn4.explainthatstuff.com/dot.gif
  10. https://cdn4.explainthatstuff.com/dot.gif
  11. https://cdn4.explainthatstuff.com/dot.gif
  12. https://cdn4.explainthatstuff.com/dot.gif
  13. https://cdn4.explainthatstuff.com/dot.gif
  14. https://cdn4.explainthatstuff.com/dot.gif
  15. https://cdn4.explainthatstuff.com/dot.gif
  16. https://cdn4.explainthatstuff.com/dot.gif
  17. https://cdn4.explainthatstuff.com/dot.gif
  1. https://www.facebook.com/plugins/like.php?href=https%3A%2F%2Fwww.explainthatstuff.com%2F&width=90&layout=button_count&action=like&size=small&share=false&height=21&appId=1678539732394615
Image format
There are 57 images that are not using the AVIF, WebP format.
  1. https://cdn4.explainthatstuff.com/dot.gif
  2. https://cdn4.explainthatstuff.com/dot.gif
  3. https://cdn4.explainthatstuff.com/ccd-chip4.jpg
  4. https://cdn4.explainthatstuff.com/breathless-chris-woodford-198x300.png
  5. https://cdn4.explainthatstuff.com/dot.gif
  6. https://cdn4.explainthatstuff.com/dot.gif
  7. https://cdn4.explainthatstuff.com/dot.gif
  8. https://cdn4.explainthatstuff.com/icon-az.png
  9. https://cdn4.explainthatstuff.com/icon-dates.png
  10. https://cdn4.explainthatstuff.com/icon-dice.png
  11. https://cdn4.explainthatstuff.com/icon-search.png
  12. https://cdn4.explainthatstuff.com/icon-ets.png
  13. https://cdn4.explainthatstuff.com/nasa-airs-warming-thumb.jpg
  14. https://cdn4.explainthatstuff.com/thumb-heat-pump.png
  15. https://cdn4.explainthatstuff.com/thumb-atoms.png
  16. https://cdn4.explainthatstuff.com/thumb-offsets.jpg
  17. https://cdn4.explainthatstuff.com/thumb-mirror-segments-james-webb.jpg
  18. https://cdn4.explainthatstuff.com/chess-game-middle-thumb.jpg
  19. https://cdn4.explainthatstuff.com/weightless-astronauts-vomit-comet-thumb.jpg
  20. https://cdn4.explainthatstuff.com/thumb-shuttle.jpg
  21. https://cdn4.explainthatstuff.com/crane-pulleys-red-thumb.jpg
  22. https://cdn4.explainthatstuff.com/aristotle-freeze-highsmith-thumb.jpg
  23. https://cdn4.explainthatstuff.com/computer-software-dvd-thumb.jpg
  24. https://cdn4.explainthatstuff.com/silverback-gorilla-bamboo-thumb.jpg
  25. https://cdn4.explainthatstuff.com/nasa-blue-organisms-lighting-thumb.jpg
  26. https://cdn4.explainthatstuff.com/radio-thumb.jpg
  27. https://cdn4.explainthatstuff.com/crop-spraying-tractor-thumb.jpg
  28. https://cdn4.explainthatstuff.com/electricity-plug-thumb.jpg
  29. https://cdn4.explainthatstuff.com/atomic-force-microscope-tips-thumb.jpg
  30. https://cdn4.explainthatstuff.com/magnet-big-thumb.jpg
  31. https://cdn4.explainthatstuff.com/rackandpiniongear-thumb.jpg
  32. https://cdn4.explainthatstuff.com/batteries-thumb.jpg
  33. https://cdn4.explainthatstuff.com/electric-motor-closeup-thumb.jpg
  34. https://cdn4.explainthatstuff.com/nasa-airs-warming-thumb.jpg
  35. https://cdn4.explainthatstuff.com/google-apps-smartphone-screen-thumb.jpg
  36. https://cdn4.explainthatstuff.com/digitalcamera-thumb.jpg
  37. https://cdn4.explainthatstuff.com/integrated-circuit-microcontroller-thumb.jpg
  38. https://cdn4.explainthatstuff.com/digital-multimeter-thumb.jpg
  39. https://cdn4.explainthatstuff.com/bluegasflameenergy-thumb.jpg
  40. https://cdn4.explainthatstuff.com/spring-arch-fingers-thumb.jpg
  41. https://cdn4.explainthatstuff.com/organicbox-thumb.jpg
  42. https://cdn4.explainthatstuff.com/sony-bravia-flatscreen-tv-thumb.jpg
  43. https://cdn4.explainthatstuff.com/solar-control-low-e-glass-thumb.jpg
  44. https://cdn4.explainthatstuff.com/steel-framed-building-construction-thumb.jpg
  45. https://cdn4.explainthatstuff.com/soap-bubble-color-interference-thumb.jpg
  46. https://cdn4.explainthatstuff.com/hydraulicdigger2-thumb.jpg
  47. https://cdn4.explainthatstuff.com/c17globemasterplane-thumb.jpg
  48. https://cdn4.explainthatstuff.com/optical-mouse-light-guide.jpg
  49. https://cdn4.explainthatstuff.com/dot.gif
  50. https://cdn4.explainthatstuff.com/dot.gif
  51. https://cdn4.explainthatstuff.com/dot.gif
  52. https://cdn4.explainthatstuff.com/dot.gif
  53. https://cdn4.explainthatstuff.com/dot.gif
  54. https://cdn4.explainthatstuff.com/dot.gif
  55. https://cdn4.explainthatstuff.com/dot.gif
  56. https://cdn4.explainthatstuff.com/dot.gif
  57. https://cdn4.explainthatstuff.com/dot.gif
JavaScript defer
The javascript resources have the defer attribute set.
DOM size
The DOM size is optimal.
The HTML file has 428 DOM nodes.
Security
HTTPS encryption
The webpage uses HTTPS encryption.
The HTML file has https://www.explainthatstuff.com/ DOM nodes.
Mixed content
There are no mixed content resources on the webpage.
Server signature
The webpage has a public server signature.
Apache
Unsafe cross-origin links
The webpage does not have unsafe cross-origin links.
Plaintext email
The webpage does not contain any plaintext emails.
Miscellaneous
Structured data
The webpage has structured data.
      Meta viewport
      The webpage has a meta viewport tag set.
      width=device-width, initial-scale=1.0
      Character set
      The webpage does not have a charset declared.
      Sitemap
      No sitemaps found.
      Content length
      The webpage has 1,860 words.
      Text to HTML ratio
      The text to HTML ratio is 23%.
      Inline CSS
      The webpage does not contain inline CSS code.
      Deprecated HTML
      There are no deprecated HTML tags on the webpage.