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## Is the ten's digit even in any power of 20n+c, where c is an odd digit?

Prove or disprove that in any power of $20n+c$, where $c$ is an odd digit (i.e., $1,3,5,7,9$), the ten's digit is even. This is probably a generalization of this. I tried in the following wa

mathematics

## Should you perform conditioning training until you cannot go on any longer?

I hear from time to time that people consider it valuable to perform conditioning training until you cannot go on any longer. Some people I have talked to are proud that they have trained until they

physical-fitness

## How does wiggling your fingers activate your fast twitch muscle fibers?

You may remember hurdler Michelle Jenneke's famous dance where she wiggles her fingers to warm up before the race. In this interview (at 01:11), she reveals that wiggling her fingers activates her

physical-fitness

## How to find active training partners through Endomondo?

I have used Endomondo now many years for sports such as skiing, running and racewalking. It has my training plan for half-marathon and a lot of results showing progress but I feel very alone in usi...

physical-fitness

## What is a good training program for a Quidditch Snitch?

For those of you who aren't Harry Potter fans, Quidditch is a wizard sport played on broomstick that has been modified for us non-flying people and is now pretty popular (Quidditch World Cup is co

physical-fitness

## Differences between running cross country and track

I wonder about the differences between running on a track and running cross country. I know that it is very dependant on the condition of the x-country course, but I did some research and failed t...

physical-fitness

## Is Riemann Zeta Function symmetrical about the real axis?

From wikipedia, http://en.wikipedia.org/wiki/Riemann_zeta_function "Furthermore, the fact that $\zeta(s) = \zeta(s^*)^*$ for all complex s ≠ 1 ($s^*$ indicating complex conjugation) implies th

mathematics

## Is this an effective military PRT training plan?

The military PRT, Physical Readiness Test, requires one to do a minimum number of pushups and situps followed by a 1.5 mile run. I'm a good runner, so the main concern is my weak upperbody. A mo

physical-fitness

## How should a young person train for parkour?

I really want to start training parkour, but I have no idea where to start. I'm only 13, but I'm reasonably fit, and already run regularly. I also found a strength training routine that I int

physical-fitness

## How to overcome fear?

I assume this is a very atypical question for this community, but I believe it's on-topic, so, I'll go ahead with this. I was hoping someone could help me resolve the problem of overcoming fe

physical-fitness

## How do I workout my heart rate zones for training?

Is there a relatively easy way to get better values for my heart rate zones if I already have a heart rate monitor? A couple workouts I've done have my heart rate in the "hard" zone for

physical-fitness

## Why am I earning more nikefuel than other people?

I'm using Nike+SportBand (a pedometer) and I got about 262 nikeFuel per kilometer. My friend has Nike+Running App (tracking using GPS) in his android phone and he gets 207 nikefuel per kilometer.

physical-fitness

## How can I avoid the Man with the Hammer?

I'm in my second week of my marathon training and today I had my second threshold training. So where my normal workouts are mostly of moderate intensity, these threshold training's have a

physical-fitness

## What are some signs of overtraining?

I'm currently working out 5-6 days a week, typically 3 days of weights and 2-3 of HIIT/Tabata. My focus is on strength and endurance training (not size). When I feel tired I take a day off...som

physical-fitness

## Why temporal lobe is called temporal?

http://en.wikipedia.org/wiki/Temporal_lobe Does this have something to do with tempo (time?) Temporal lobe is behind (posterior) to frontal lobe, inferior to parietal lobe and is in front of occi...

biology

## Elliptical trainer vs. running

Say I am looking for a 30 min. cardio workout for 3 times a week. Goal is to reduce resting heart rate and improve general fitness. Which is better: Elliptical trainer (say: max resistance, 90-11...

physical-fitness

## Find the equation of the line perpendicular to AB passing through B

I'm not sure on how to work out this question: 'Find the equation of the line perpendicular to AB passing through B A = 0,1 B = 10,6 The equation of the straight line through A and B is y

mathematics

## Are animals that live in areas where avalanches happen equipped to deal with that?

Humans take courses to learn how to assess the risk of avalanches and how to deal with it. Additionally, they often use special gear to survive avalanches if they got caught in the middle of one. ...

biology

## Intuitive explanation for Kin- and Group- selection

It is known from theoretician in the field of kin selection that kin selection (inclusive fitness theory) and group selection are actually two sides of the same coin. In other words, these two conc...

biology

I made a statement about tropical rainforests, and I want to know if it's somewhat true or not: The soil in tropical rainforests is not exceptionally fertile, because it contains few minerals. Th

biology

## Can stress echocardiography show coronary blood flow difference before and after exercise?

Stress echocardiography means a pair of cardiac ultrasound imaging examinations, before and after exercise. I assume that coronary blood flow is increased after exercise. Is cardiac ultrasound tech...

biology

## What is the difference between average and monoisotopic mass calculations of peptides?

I often have to calculate the mass of peptide sequences using calculators such as here. I have the option of calculating the average and monoisotopic mass, but what is the difference?

biology

## Can positive and negative blood type of a couple lead to miscarriage?

I want to know can $+ve$ and $-ve$ blood group of a couple could be a cause of miscarriage in pregnancy?

biology

## How long does Lentivirus take to express in vivo mouse neurons?

Does anyone know how long it takes for a standard Lentivirus vector to express its genes (under a strong promoter such as CAG, CB7, etc.), after injection into the brain of a mouse? By hearsay I t...

biology

## How can the child and the mother have different blood types?

As far as I know the fetus is fed by the umbilical cord which basically connects his/her circulatory system with the mother's in order to supply oxygen and nutrients. But how is this possible if t

biology