Replaces some var values with defines

code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm

@@ -44,20 +44,20 @@ Doesn't work on other aliens/AI.*/
 	if(plasma_cost > 0)
 		return "[plasma_cost]"
 
-/obj/effect/proc_holder/alien/proc/cost_check(check_turf=0,mob/living/carbon/user,silent = 0)
+/obj/effect/proc_holder/alien/proc/cost_check(check_turf = FALSE, mob/living/carbon/user, silent = FALSE)
 	if(user.stat)
 		if(!silent)
 			to_chat(user, "<span class='noticealien'>You must be conscious to do this.</span>")
-		return 0
+		return FALSE
 	if(user.getPlasma() < plasma_cost)
 		if(!silent)
 			to_chat(user, "<span class='noticealien'>Not enough plasma stored.</span>")
-		return 0
+		return FALSE
 	if(check_turf && (!isturf(user.loc) || isspaceturf(user.loc)))
 		if(!silent)
 			to_chat(user, "<span class='noticealien'>Bad place for a garden!</span>")
-		return 0
-	return 1
+		return FALSE
+	return TRUE
 
 /obj/effect/proc_holder/alien/proc/check_vent_block(mob/living/user)
 	var/obj/machinery/atmospherics/components/unary/atmos_thing = locate() in user.loc
@@ -71,7 +71,7 @@ Doesn't work on other aliens/AI.*/
 	name = "Plant Weeds"
 	desc = "Plants some alien weeds."
 	plasma_cost = 50
-	check_turf = 1
+	check_turf = TRUE
 	action_icon_state = "alien_plant"
 
 /obj/effect/proc_holder/alien/plant/fire(mob/living/carbon/user)

code/modules/mob/living/carbon/carbon_defines.dm

@@ -7,7 +7,7 @@
 	var/list/stomach_contents		= list()
 	var/list/internal_organs		= list()	//List of /obj/item/organ in the mob. They don't go in the contents for some reason I don't want to know.
 	var/list/internal_organs_slot= list() //Same as above, but stores "slot ID" - "organ" pairs for easy access.
-	var/silent = 0 		//Can't talk. Value goes down every life proc. //NOTE TO FUTURE CODERS: DO NOT INITIALIZE NUMERICAL VARS AS NULL OR I WILL MURDER YOU.
+	var/silent = FALSE 		//Can't talk. Value goes down every life proc. //NOTE TO FUTURE CODERS: DO NOT INITIALIZE NUMERICAL VARS AS NULL OR I WILL MURDER YOU.
 	var/dreaming = 0 //How many dream images we have left to send
 
 	var/obj/item/handcuffed = null //Whether or not the mob is handcuffed

code/modules/mob/living/carbon/death.dm

@@ -2,7 +2,7 @@
 	if(stat == DEAD)
 		return
 
-	silent = 0
+	silent = FALSE
 	losebreath = 0
 
 	if(!gibbed)

code/modules/mob/living/carbon/human/species_types/shadowpeople.dm

@@ -200,7 +200,7 @@
 	if(istype(O, /obj/item/device/pda))
 		var/obj/item/device/pda/PDA = O
 		PDA.set_light(0)
-		PDA.fon = 0
+		PDA.fon = FALSE
 		PDA.f_lum = 0
 		PDA.update_icon()
 		visible_message("<span class='danger'>The light in [PDA] shorts out!</span>")