diff --git a/doc/research.md b/doc/research.md
index 590d70b..45abd3e 100644
--- a/doc/research.md
+++ b/doc/research.md
@@ -143,16 +143,17 @@ New mechanics:
 
 Relations between mechanics:
 
-- [ ] Pressure decelerates you
-    - relative to the motion of the planet plus the wind
-    - scaled by your surface area
+- [X] Pressure decelerates you
+    - [X] relative to the motion of the planet
+    - [ ] accounting for the wind
+    - [X] scaled by your surface area
 - [ ] Ambient temperature heats up suit/vehicle temperature, depending on density
 - [ ] [Buoyancy](https://en.wikipedia.org/wiki/Buoyancy): upward acceleration depending on densities (yours and ambient), altitude (gravitational acceleration), and your mass
     - Negligible for any current vehicles but could be cool for zeppelins
-- [ ] [Drag?](https://en.wikipedia.org/wiki/Drag_(physics)) (with different drag coefficients depending on vehicle and angle)
-    - [ ] [Form drag](https://en.wikipedia.org/wiki/Parasitic_drag#Form_drag)
+- [X] [Drag?](https://en.wikipedia.org/wiki/Drag_(physics)) (with different drag coefficients depending on vehicle and angle)
+    - [X] [Form drag](https://en.wikipedia.org/wiki/Parasitic_drag#Form_drag)
     - [ ] [Lift-induced drag](https://en.wikipedia.org/wiki/Lift-induced_drag)
-- [ ] Death at pressure of ~400 bar through implosion (depending on vehicle)
+- [X] Death at pressure of ~1000 bar through implosion (depending on vehicle)
 - [ ] Death at high temperatures through continuous damage when temperature exceeds 60°C
 - [ ] Hydrogen + Oxygen = Water, used for evaporative cooling (works only at right pressure/temperature)
 - [ ] Refill Hydrogen inside Jupiter's atmosphere