Saturday, May 18, 2019

How cryptocurrency scams work

File: In 2018, losses from cryptocurrency-related crimes amounted to US$1.7-billion.
AFP/Nhac Nguyen
GREENSBORO - Millions of cryptocurrency investors have been scammed out of massive sums of real money.
In 2018, losses from cryptocurrency-related crimes amounted to US$1.7-billion.
The criminals use both old-fashioned and new-technology tactics to swindle their marks in schemes based on digital currencies exchanged through online databases called blockchains.
From researching blockchaincryptocurrency and cybercrime, I can see that some cryptocurrency fraudsters rely on tried-and-true Ponzi schemes that use income from new participants to pay out returns to earlier investors.
Others use highly automatized and sophisticated processes, including automated software that interacts with Telegram, an internet-based instant-messaging system popular among people interested in cryptocurrencies. Even when a cryptocurrency plan is legitimate, fraudsters can still manipulate its price in the marketplace.
An even more basic question arises, though: How are unsuspecting investors attracted to cryptocurrency frauds in the first place?
Fast-talking swindlers
Some cryptocurrency fraudsters appeal to people’s greed, promising big returns. For example, an unknown group of entrepreneurs runs the scam bot iCenter, which is a Ponzi scheme for Bitcoin and Litecoin. It doesn’t provide information on investment strategies, but somehow promises investors 1.2% daily returns.
The iCenter scheme operates through a group chat on Telegram. It starts with a small group of scammers who are in on the racket. They get a referral code that they share with others, in blogs and on social media, hoping to get them to join the chat. Once there, the newcomers see encouraging and exciting messages from the original scammers. Some newcomers decide to invest, at which point they are assigned an individual bitcoin wallet, into which they can deposit bitcoins. They agree to wait some period of time – 99 or 120 days – to receive a significant return.
During that time, the newcomers often use social media to share their own referral codes with friends and contacts, bringing more people into the group chat and into the investment scheme. There’s no actual investment of the funds in any legitimate business. Instead, when new people join, the person who recruited them gets a percentage of the new funds, and the cycle continues, paying out to earlier participants from each round of newer investors.
Some members work especially hard to bring in new funds, posting tutorial videos and pictures of themselves holding large amounts of money as enticements to join the scam.
Lies and more lies
Some scammers go for straight-up deception. The founders of scam cryptocurrency OneCoin defrauded investors of $3.8 billion by convincing people their nonexistent cryptocurrency was real.
Other scams are based on impressing potential victims with jargon or claims of specialized knowledge. The Global Trading scammers claimed they took advantage of price differences on various cryptocurrency exchanges to profit from what is called arbitrage – simply buying cheaply and selling at higher prices. Really they just took investors’ money.
Global Trading used a bot on Telegram, too – investors could send a balance inquiry message and get a response with false information about how much was in their account, sometimes even seeing balances climb by 1% in an hour. With returns looking like that, who could blame people for sharing the scheme with their friends and family on social media?
Exploiting friends and family
Once a scheme has started, it stays alive – at least for a while – through social media. One person gets taken in by the promise of big returns on cryptocurrency investments and spreads the word to friends and family members.
Sometimes big names get involved. For instance, the kingpin behind GainBitcoinand other alleged scams in India convinced a number of Bollywood celebrities to promote his book, “Cryptocurrency for Beginners.” He even tried to make himself a bit of a celebrity, proclaiming himself a “cryptocurrency guru,” as he led efforts thatcost investors between $769 million and $2 billion.
Not all the celebrities know they’re involved. In one blog post, iCenter featured a video that purported to be an endorsement by Dwayne “The Rock” Johnson, holding a sign featuring iCenter’s logo. Videos of Justin Timberlake and Christopher Walken were deceptively edited so they appeared to praise iCenter, too.
Dwayne ‘The Rock’ Johnson does not actually endorse this cryptocurrency scam.
Fraudulent initial coin offerings
Another popular scam technique is called an “initial coin offering.” A potentially legitimate investment opportunity, an initial coin offering essentially is a way for a startup cryptocurrency company to raise money from its future users: In exchange for sending active cryptocurrencies like bitcoin and ethereum, customers are promised a discount on the new cryptocoins.
Many initial coin offerings have turned out to be scams, with organizers engaging in cunning plots, even renting fake offices and creating fancy-looking marketing materials. In 2017, a lot of hype and media coverage about cryptocurrencies fed a huge wave of initial coin offering fraud. In 2018, about 1,000 initial coin offering efforts collapsed, costing backers at least $100 million. Many of these projects had no original ideas – more than 15% of them had copied ideas from other cryptocurrency efforts, or even plagiarized supporting documentation.
Investors looking for returns in a new technology sector are still interested in blockchains and cryptocurrencies – but should beware that they are complex systems that are new even to those who are selling them. Newcomers and relative experts alike have fallen prey to scams.
In an environment like the current cryptocurrency market, potential investors should be very careful to research what they’re putting their money into and be sure to find out who is involved as well as what the actual plan is for making real money – without defrauding others

Saturday, February 2, 2019

Atrial septal Defect


https://youtu.be/kva97Lxuflshttps://youtu.be/kva97Lxufls
ASD
 "hole" in the wall that separates the top two chambers of the heart.
This defect allows oxygen-rich blood to leak into the oxygen-poor blood chambers in the heart. ASD is a defect in the septum between the heart's two upper chambers (atria). The septum is a wall that separates the heart's left and right sides.
More information for parents of children with ASD
What causes it?
Every child is born with an opening between the upper heart chambers. It's a normal fetal opening that allows blood to detour away from the lungs before birth. After birth, the opening is no longer needed and usually closes or becomes very small within several weeks or months.
Sometimes the opening is larger than normal and doesn't close after birth. In most children the cause isn't known. Some children can have other heart defects along with ASD.
How does it affect the heart?
Normally, the left side of the heart only pumps blood to the body, and the right side of the heart only pumps blood to the lungs. In a child with ASD, blood can travel across the hole from the left upper heart chamber (left atrium) to the right upper chamber (right atrium) and out into the lung arteries.
If the ASD is large, the extra blood being pumped into the lung arteries makes the heart and lungs work harder and the lung arteries can become gradually damaged.
If the hole is small, it may not cause symptoms or problems. Many healthy adults still have a small leftover opening in the wall between the atria, sometimes called a Patent Foramen Ovale (PFO).
How does the ASD affect my child?
Children with an ASD often have no symptoms. If the opening is small, it won't cause symptoms because the heart and lungs don't have to work harder. If the opening is large, the only abnormal finding may be a murmur (noise heard with a stethoscope) and other abnormal heart sounds. In children with a large ASD, the main risk is to the blood vessels in the lungs because more blood than normal is being pumped there. Over time, usually many years, this may cause permanent damage to the lung blood vessels.
Can the ASD be repaired?
If the opening is small, it doesn't make the heart and lungs work harder. Surgery and other treatments may not be needed. Small ASDs that are discovered in infants often close or narrow on their own. There isn't any medicine that will make the ASD get smaller or close any faster than it might do naturally.
If the ASD is large, it can be closed with open-heart surgery, or by cardiac catheterization using a device inserted into the opening to plug it. Sometimes, if the ASD is an unusual position within the heart, or if there are other heart defects such as abnormal connections of the veins bringing blood from the lungs back to the heart (pulmonary veins), the ASD can't be closed with the catheter technique. Then surgery is needed.
Closing a large ASD by open-heart surgery usually is done in early childhood, even in patients with few symptoms, to prevent complications later. Many defects can be sewn closed without using a patch.

Wednesday, September 26, 2018

LIPOMAS

Lipomas are slow growing and usually harmless. Rarely, they can be cancerous. Some people have more than one.
Lipomas are just under the skin and move easily when pressure is applied. They commonly occur in the neck, shoulders, back, abdomen, arms and thighs.
Treatment generally isn't necessary, but if the lipoma is bothersome, painful or growing, surgical removal may be required.

Regulation of blood pressure

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Falling blood pressurestimulates increased sympathetic activity, which leads to increased heart rate, contractility, vasoconstriction, andblood pressure. Long-term blood pressure regulation involves renalregulation of bloodvolume via the renin- angiotensin mechanism and aldosterone mechanism.