The calorie expenditure for road cycling and mountain biking can vary based on factors such as intensity, terrain, and duration. Generally, road cycling on flat terrain at a moderate pace can burn around 400-600 calories per hour, while mountain biking on varied terrain with hills and obstacles can burn around 500-800 calories per hour. The higher calorie expenditure in mountain biking is due to the increased effort required to navigate the challenging terrain and obstacles. Overall, mountain biking tends to result in a higher calorie expenditure compared to road cycling. **

The Federal President of Germany and the US President have different roles and powers. The Federal President of Germany is a ceremonial figurehead with limited political power, while the US President is the head of state and government with significant executive authority. The Federal President is elected by a special assembly, while the US President is elected through the Electoral College. Additionally, the Federal President's role is largely symbolic, while the US President has the power to make important policy decisions and sign legislation into law. **

Yes, Joe Biden is currently the President of the United States. He was inaugurated as the 46th president on January 20, 2021, following the 2020 presidential election. Biden won the election and took office as the president, succeeding Donald Trump. **

Whether or not you should stop mountain biking depends on your personal circumstances and reasons for considering stopping. If you are experiencing physical pain or injury from mountain biking, it may be wise to take a break and seek medical advice. If you are feeling burnt out or no longer enjoying the activity, it may be beneficial to explore other forms of exercise or outdoor activities. Ultimately, the decision to stop mountain biking should be based on your own well-being and enjoyment. **

The Federal President of Germany has fewer powers compared to the Reich President of the Weimar Republic because the post-World War II Basic Law (Constitution) of Germany was designed to prevent the concentration of power in a single individual, as seen during the Weimar Republic. The Federal President's role is largely ceremonial and symbolic, with limited executive powers, while the Reich President had more authority over the government and military. The shift in powers reflects a desire for a more balanced and democratic system of governance in post-war Germany. **

The Federal President is the head of state in Germany and has a largely ceremonial role, representing the country at official events and signing laws. The President of the Bundestag is the presiding officer of the German parliament and is responsible for maintaining order and overseeing the legislative process. The Chancellor, on the other hand, is the head of government and holds the most powerful political position in Germany, responsible for setting government policy and representing the country internationally. While the Federal President and President of the Bundestag have more symbolic and procedural roles, the Chancellor is the key decision-maker in the German government. **

No, Barack Obama cannot become president again. The United States Constitution limits presidents to serving two terms in office. Obama served two terms from 2009 to 2017, so he is not eligible to run for president again. **

As an AI, I do not have personal preferences. Each president brings their own unique qualities and policies to the table, and it is important to evaluate them based on their actions and impact on society. It is up to individuals to decide which president aligns best with their values and beliefs. **