So we have two problems here, we want a nice evenly chopped onion -- that everyone else seems to do so easily -- and we don't want to cry in the process.
First, let's address those tears. You are less likely to need tissues if you use a red onion rather than a white or brown one, but obviously this depends on the recipe -- sometimes only a big Spanish onion will do!
Now here comes the science bit... When you cut into an onion a form of gas is released which is the reason for the tears. There are many methods bandied around, but the sure fire one that works is to breathe only through your mouth and not your nose. If you breathe through your nose then you are inhaling that gas which goes straight up the nose and aggravates your tear ducts. 
Of course, you could just remember to breathe through your mouth only, but whilst concentrating on chopping you could try holding a wooden spoon handle (or similar) in your mouth; keeping your mouth open and forcing you to breathe that way only. Personally, the thought of drool on my utensils is usually enough to motivate me to just remember to essentially cut off my nose from the breathing process when chopping, but I'll leave that to you!
As for the chopping, the best way is to cut off the top bit of the onion (the pointy bit), peel, and cut the onion in half through the middle of the root.
Lay an onion half face down on your chopping board. Make cuts through and down the onion, but do not cut into the root -- keep your cuts maybe 1/2 inch away from the root. If you want slices then all you need to do now is to chop off the root and you are left with perfect slices and no mess.
For a chopped onion, turn your onion 180 degrees and chop to create your little onion pieces, finishing at the root end.
Essentially with both of these methods you are using the root as a holder for the rest of the onion as you chop.
Comments
Thank you Katiem2. That means a lot coming from one of my favorite Wizzley peeps :)
Simply had to revisit this useful kitchen helper!
Apologies, I can't find a way of editing a post to correct my error. Sorry Catana and thanks for your input.
Catana, please, with just one N.
If someone doesn't have the choice of a larger pot, adding a bit of oil to the water to keep it from foaming over is a legitimate and useful tip.
Thank you kimbesa. It's always good to get a few new tips, and I'm glad this helped :)
@Cantana, obviously we all have our own unique ways of doing things. Adding oil to the pan definitely doesn't stop pasta from sticking, which was my point. If your water is foaming up and over the edge then you just need less water or a bigger pan.
Great! I know some of these, but I learned some new tips for easier kitchen prep, too. Thanks!
I often add a bit of oil to the pasta, but only if the pot is fairly full and I want to cook on high rather than a slow roll. The oil prevents the water from foaming up and over the edge.
As for the mango -- any Floridian would know your method is just for amateurs who want to make things pretty. The proper way to eat a mango is to peel it, then stand over the sink and chomp away. Drippy and delightful.
Oh Victoria I'm so pleased I could help you. I think the pasta one is a common error to be honest. Thanks for taking the time to comment :-)
I love this article! I never knew about NOT putting oil in pasta. And I love your making my own stock trip. Great for my veggies that are about to go bad. I love cooking and food stuff, so I'm looking forward to your next ten!
Oooh thank you Jerrico. I will add it to the list for part two of the article - and it's one I didn't know and drives me crazy! PM me your wizzle's URL and I'll link to it.