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A reentrancy attack occurs when a malicious contract calls back into the vulnerable contract before the first function execution completes. The famous DAO hack in 2016 stole $60M+ using this techni...
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No. Solidity 0.8.0 and later have built-in overflow/underflow protection by default. Arithmetic operations automatically revert on overflow. SafeMath is only needed for Solidity 0.7.x and earlier. ...
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Using tx.origin for authentication is vulnerable to phishing attacks. If a user calls a malicious contract, that contract can call your contract, and tx.origin will still be the user's address (not...
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The Checks-Effects-Interactions pattern is a best practice to prevent reentrancy: (1) Checks - validate conditions with require(), (2) Effects - update contract state variables, (3) Interactions - ...
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The security score is a rough estimate based on detected issues: Critical issues deduct 30 points each, High deduct 15, Medium deduct 8, Low deduct 3. A score of 90+ suggests few issues, but this i...
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Typical APRs range from ~5.5–7.5% for excellent credit, 7.5–10% for good, 10–14% for fair, and 14–18%+ for poor credit. Promo 0% offers can appear near end of season for new models.
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End of season (March–April) typically yields 15–25% discounts and the best 0% APR promos as dealers clear inventory. Selection is good, prices are lower.
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Common terms are 24–72 months. Longer terms reduce monthly payments but increase total interest; shorter terms save on interest but cost more monthly.
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Insurance ($300–$800/yr), registration ($25–$100/yr), trail passes ($35–$150/yr), maintenance ($500–$1,200/yr), fuel ($30–$75 per ride), and storage ($0–$1,200/yr).
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Used sleds (2–5 years old) often provide the best value with 30–40% depreciation already taken. New sleds may qualify for lower rates and promos but depreciate faster in early years.
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The best age to claim Social Security depends on your health and financial needs. Claiming at 62 reduces your benefits by 30%, while waiting until Full Retirement Age (66-67) gives you 100%, and de...
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A spouse can receive up to 50% of the higher earner's benefit at Full Retirement Age, even if they never worked. You must be married for at least 1 year. If you claim spousal benefits early (before...
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Yes, but there's an earnings test. In 2025, if you're under FRA, Social Security withholds $1 for every $2 you earn above $22,320. In the year you reach FRA, it's $1 for every $3 above $59,520 unti...
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Possibly. If your combined income (AGI + nontaxable interest + half of Social Security) exceeds $25,000 (single) or $32,000 (married filing jointly), up to 85% of benefits become taxable. This does...
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Benefits are based on your Average Indexed Monthly Earnings (AIME) from your highest 35 years of earnings. The Social Security Administration applies bend points to your AIME: 90% of the first $1,2...
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Your PIA is your base Social Security benefit at Full Retirement Age (FRA). It's calculated using: Your highest 35 years of earnings (adjusted for inflation), Average Indexed Monthly Earnings (AIME...
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Your FRA depends on birth year: Born 1943-1954: Age 66 | Born 1955: Age 66 + 2 months | Born 1956: Age 66 + 4 months | Born 1957: Age 66 + 6 months | Born 1958: Age 66 + 8 months | Born 1959: Age 6...
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Claiming Early (age 62): Permanent reduction of ~30% (if FRA is 67), more years of benefits but smaller checks, break-even typically around age 78-80. Delaying (to age 70): Permanent increase of ~2...
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