Quantum Physics. It's truly fun stuff. Unfortunately it is very confusing because half of the things that are "proven", actually contradict each other.

A basic example is light is sometimes a wave BUT at other times it is a particle. Like I said... fun stuff.

I love geography. Geography explains everything. History was molded by geography. There is not one question about politics, economics, history, or culture that is not answered by geography.

Why did Europe succeed early on with science and culture and go on to exploit Africa and Asia? The excessive waterways, oceans, seas, and ease of maritime trade allowed for information, science, and technology to spread faster then overland routes in China and Africa.

Next?

Mine is Chemistry. I love to learn about chemical reactions and experiment with chemicals.

I like computer science its fun and doesn't involve much pain

My favorite branch of science is biology because i love animals so much. and its one of the easier branch's for me.

Biology, especially the science of diseases and viruses.

My favorite is outer space, and fish (would that be marine biology?)

My favorite would be Chemistry, Physics ,and Time and Space (I think this is astronomy...)

Favorite element group is the Noble Gases, because...well, like the name implies, the group is mostly independent and barely can make a compound.

MY favorite branch of science is Chemistry, i love to mix and max liquids and to have a reaction from it and then document that reaction, Chemistry was my favorite class in school.

Well I love Mathematics and am fascinated by it.  Physics give me my reason of living, because it is in our daily life. 
We need both Physics and Mathematics so as to unravel the mysteries of life, space, time, evolution hence I adore Astronomy.

i like doing projects so learning how things react :/

My favourite would have to be astrology. I love reading about our universe , following our space exploration, and looking at beautiful pictures of distant galaxies.

My second favourite is probably physics because it helps explain how things work. I actually dropped out of my high school physics course because I was failing at it, but I still find it to be a very interesting area of science.

quantum physics and astrophysics i just love everything to do with the small and the very large like quarks and quasars and how the small and large arnt that different, i also love stephen hawkins far fetched theories, i've always liked making myself feel small in the vast nothingness that is space and the potential dimensions and everything it awe-inspiring and a real passion of mine

Outer space

my favorite branch of science is definitely astrology. learning about galaxies, moons, stars, planets, and supernovas and whatnot i just so fun. chemistry is fun too. mixing things together, seeing them explode, or fizz, or whatever just sounds like it would be fun as well. but i duno since i havent gotten to be able to take chemistry DX

I took chemistry my senior year and I always found it very interesting. The experiments we did were actually a lot of fun, haha. 

I've also always loved psychology. Learning how the human mind works has always fascinated me. Plus, I got an award for it in my senior year for the highest grade. =P Yeah. 

My favorite branch of science is Chemistry as that is where almost all of my background lies. I have a Chemical Diploma and am currently working towards my fire-assay certificate. I have also always loved both Psychology and Astronomy. 

Back when I was a kid my favorite were earth sciences like animal biology and geology. I had a particular love for marine biology, and a crippling fear of sharks and what lurks in the deep, but I think it was the intense fear of that unknown that made it particularly fascinating. I still do love deep sea science, especially the fascinating creatures that communicate via bio luminescence.

Nowadays my favorite and my focus in school is in medical biology, and particularly I like the Central Nervous System and the Endocrine system. I am very interested in the ways drugs affect people, particularly I have been finding the research on hallucinogenic drugs being able to cure depression, anxiety, and other drug addictions very fascinating, not to mention the drug DMT, Dimethyltriptamine being a hallucinogen that might be responsible for our dreams, as it is produced naturally in all mammals and some plants.

I guess you could say I'm very interested in Biochemistry in the medical context.

Definitely Physics...but what field is my favourite?

Hmm...I definitely like studying motion and forces, but I seem to have a slight uncanny interesting in nuclear and how raw energy works. 

EDIT: Didn't know I already posted in this thread.