+=======================================+
|                                       |
|            Earth Impact!              |
|     Saving Earth with Newton's        |
|    Universal Law of Gravitation       |
| Adapted from STEM Behind Hollywood    |
|  by and (c) 2013 Texas Instruments    |
|                                       |
| TI-84 Plus C Silver Edition port by   |
| Christopher Mitchell of Cemetech;     |
| teacher and student handouts modified |
| with apologies and an olive branch    |
| to TI. Images from NASA.gov.          |
|                                       |
+=======================================+

Included in this package:
- readme.txt: This document
- Earth_Impact_Teacher.pdf: Teacher notes
- Earth_Impact_Student.pdf: Student handout
- ERTHIMPT.8xp: TI-84+CSE Earth Impact! program
- EITD.8xv: AppVar containing text and images

Please see either of the PDF files for how to
load and use this activity. It requires Doors CS 8.1
or higher, available from http://dcs.cemetech.net.

Image Credits:
--------------
Images used are stylized artist’s renditions based on images from the following nasa.gov pages:
• Title screen: https://solarsystem.nasa.gov/news/display.cfm?News_ID=43564
• Asteroid: http://www.nasa.gov/mission_pages/dawn/main/
• Asteroid impact: http://science.nasa.gov/science-news/science-at-nasa/2002/26jul_nt7/
• Dust storm: http://www.nasa.gov/centers/goddard/news/topstory/2004/0319dustbowl.html
• Tsunami: https://earthdata.nasa.gov/featured-stories/featured-research/sizing-tsunami
• Wildfire: http://scijinks.jpl.nasa.gov/imet/

Thanks:
-------------
- Texas Instruments for creating the original TI-Nspire activity (and for
  tolerating this port).
- Cemetech members Electromagnet8 and tifreak8x for beta-testing.
- Patrick Prendergast ("tr1p1ea") for creating the superb xLIBC library that
  makes this activity's graphics possible.
- Shaun McFall ("Merthsoft") for TokenIDE, with which the sprite and full-screen
  graphics in this activity were converted.
- Lorenzo Orders ("Ordelore") for his monochrome Cemetech Contest #12 entry that
  inspired this ports.
- SourceCoder 3 and jsTIfied for making coding and testing fast and easy.

History:
-----------------
2014 Oct 10: Initial release
2014 Oct 18: Repaired problem with upside-down Y-axis labeling in graphs
2014 Oct 26: Fixed launching calculator tool from graph pages
2014 Oct 27: Updated activity to use new "bgcopy" ASM stub program for speed