An annoying but benign alert message introduced by the latest version of a third-party module has been eliminated without affecting the module's function. A small mistake in Chapter 7 has been corrected. My bad. The latest versions of many software support modules—under the hood—have been updated.

• Maintenance updates of various elements. Nothing to see here folks.

• The text describing the Schrödinger’s cat problem (4.2) has been improved. • Maintenance updates of various libraries. Nothing to see here folks.

• Improved compatibility with a number of platform devices • Under the "hood" maintenance improvements.

• Improved compatibility with a number of platform devices • Fixed a display bug in lab 9.4 • Minor text corrections and improvements • Maintenance, formatting, and cosmetic improvements.

• Improved user interface in a number of laboratory exercises • Updates to improve compatibility with a number of platform devices • Maintenance, formatting, and cosmetic improvements.

• Corrected display of camera images on iPhones. Sorry about that.

• Implemented asynchronous handling of cameras • Improved geometry of imaging • Added alerts when computational overflows occur from acquired data • Fixed a display bug in lab 4.5 • Maintenance, formatting, and cosmetic improvements.

• Where appropriate, length of acoustic signals changed to 2^N (e.g. N=16 or 17) so that processing speed is improved. • Added reporting of computational timing to a number of labs • Fixed a bug in lab 12.6. My bad. • Maintenance, formatting, and cosmetic improvements.

• Added a statistical test for Poisson noise in camera images in lab 4.5. Together with lab 8.1, this will allow you to see if the camera in your device achieves state-of-the-art noise performance. • Corrected the calculation of the Chi-squared value in labs 4.4 and 4.5. • Removed extraneous alerts • Fixed potential bugs and spelling errors in Laboratory Exercises in Chapter 6. • Maintenance, formatting, and cosmetic improvements.

• Improved speed in labs 4.2 and 11.1 • Improved memory management in several labs • Fixed bugs in labs 6.6 and 9.6 • Maintenance, formatting, and cosmetic improvements.

• Revised image acquisition timing to improve responsiveness and reliability • Fixed ”Analyze” display bug in labs 4.4 and 4.5 • Maintenance, formatting, and cosmetic improvements

Almost all of the changes are "under the hood" but they are significant. They include: • A major revision of the graphical and image displays in the Laboratory Exercises to improve display compatibility with the varying screen dimensions of different tablets and smartphones. • Maintenance, formatting, and cosmetic improvements. • Correction of an equation display in a footnote in the body of the textbook.

In Laboratory Exercise 10.10: • The Wiener filtering has been expanded to include corrections for chromatic aberration in your device's camera lens. • With your correct choice of point-spread-function (psf) model, the final result is now an improvement over the image delivered by the camera. • The computation time for the three-color Wiener filtering of an image is displayed • The "edge image" is now displayed in color. • Other maintenance, formatting, corrections, and cosmetic improvements.

• Laboratory Exercise 10.10, perhaps the most ambitious until now, has beed added bringing the total to 59 laboratory experiments. In this experiment the characteristics of your back camera will be measured and used to implement advanced image filtering. The goal is to see under what circumstances the camera’s image quality can be further improved. • Other maintenance, formatting, corrections, and cosmetic improvements

• Laboratory Exercise 8.1 has been improved • Minor text changes • Other maintenance, formatting, corrections, and cosmetic improvements

• We have added an additional “Tip” that can found in the chapter entitled “Information” • We have updated the Privacy Policy that can be found at socraticsoftware.org • Other maintenance, formatting, and cosmetic improvements • Bug fixes

• Through application of blood, sweat, and fears (and the fantastic help of the international software community), the “Search” function has been restored. While most “classic” textbooks have an index at the end of the book, we provide the search function to find any topic described in this app/textbook. • We have added “Tips & Short Cuts” that can found in the chapter entitled “Information”, • Other maintenance and cosmetic improvements • Bug fixes

• Laboratory Experiment 10.8 has an improved Wiener filtering algorithm, a description that has been extended to explain the improved algorithm for computing the Wiener filter, and better graphics. • Other maintenance and cosmetic improvements

• A new laboratory experiment has been added to Chapter 10 bringing the total number of laboratory experiments to 58. • Improvement in speed and memory management • Fixed bug involving camera preview with iPhone • Other maintenance and cosmetic improvements

• Three new laboratory experiments have been added to Chapter 10 bringing the total number of laboratory experiments to 57. Some laboratory experiments in Chapter 10 have been renumbered. • Other maintenance and cosmetic improvements: more details, details, details!

• Five new laboratory experiments have been added to Chapter 8 and five new experiments to Chapter 9 bringing the total number of laboratory experiments to 54. The laboratory experiment 9.1 is now laboratory experiment 9.3. • A completely redesigned camera interface has been implemented to facilitate the experiments in Chapter 8. • With the change from iOS v13.4.1 to iOS 13.5 (and the introduction of iPadOS 13.5), mathematical equations were no longer rendered; they disappeared. To correct for this, we have implemented another method for equation rendering, a bit slower but better than no math. • Other maintenance and cosmetic improvements: details, details, details!

• Some very small errors have been corrected. Question: In the development of apps, is OCD a curse or a blessing? Answer: Yes.

• The rendering of equations in the Laboratory Exercises has been improved. • Some small errors have been corrected. “Once more unto the breach, dear friends, once more.”

• The name of the app on your device has been changed to "StochasticS" to make it easier to find/recognize when installed. • Eight new laboratory experiments have been added to the app bringing the total to 44. The new experiments can be found in Chapter 6. The laboratory experiment 6.1 is now laboratory experiment 6.7. • To make it easier in an experiment where whistling is required the frequency is now E5. • Footnote styling and graphics styling in laboratory experiments have been improved. • Typographical corrections have been made. • Other maintenance and cosmetic improvements: details, details, details!