"Bonus Experience - When you kill an enemy in the world, you might see 5 xp + 2 xp pop up . What this means is you’ll gain bonus experience depending on how long an enemy has been alive in the world, which gives you even more incentive to explore."
Enemies that have been alive (bear with me, that's a huge article. Somewhere halfway through) for a longer amount of time than other mobs give bonus experience based on the amount of time they've been around. This is to discourage grinding in one place.
Note: The amount of XP you receive is also respective of your level.
Take a look at the Wiki on the page Mystic Forge. It will tell you where the forge is, how it is used, and some predictable recipes. The forge lets you do two things. First you can create recipes to craft other items like consumables, weapons, or armor. Second, the forge can be used to create better crafting materials of one type higher.
The examples the wiki gives are as follows:
Common Crafting Material Promotion
Common crafting materials can be promoted to a small pile of higher
tier materials with the following formula. The tier of dust needed is equivalent to the tier of the wanted product. So, if you are hoping to create Orichalcum, a tier 6 common material, you need to use Crystalline Dust, a tier 6 dust. If common crafting material B is one tier higher than common crafting material A, then:
10-50 Crafting Material B = 250 Common Crafting Material A (i.e. 250 Mithril Ores) + 1 Common Crafting Material B (i.e. 1 Orichalcum Ores) + 2-5 Dust A (i.e. 5 Pile of Crystalline Dust) + 5 Philosopher's stone
In that example: That recipe will produce 10-50 Orichalcum Ores
Armor boxes and armor satchels
Recipes can be created using the Mystic Forge. They will allow you to
craft armor boxes and armor satchels, which will in turn give you
every piece of an armor set.
Armor set recipe
Ingredients
5 Bottle of Elonian Wine
20 Arcane Crystal
50 Mystic Coin
1 Armor item
Mystic coins seem to be a common item needed for Food Trays, Weapons and Armor. Also look at this page for current recipe research.
You can see this in action with this video on how to make a Giant Chocolate Cake. Details are in the video summary.
Best Answer
With regards to using Jugs/Flasks/Gulps/Drops of Karma most efficiently, the largest possible bonus at this time is 95%.
To obtain this bonus, you'll need to:
Altogether, these bonuses will combine additively to give a 95% bonus.
Additional Notes:
It's worth noting that although the Outmanned buff claims to add an extra 33% to Karma gain, it does not work for liquid karma items (and as Raven Dreamer pointed out, it actually does not work at all right now).The Outmanned buff no longer claims to add a Karma bonus (Thanks for pointing this out, Brian).Source: Guild Wars 2 Wiki page on Karma Modifiers